BULLETINS '''\';°Zr°^ JUL 20 OF 19/3 HARVARD AMERICAN ''"'"'^"'^^ PALEONTOLOGY VOL LXIII 1972-73 Paleontological Research Institution Ithaca, New York U S A 14850 Memoriam In T C Desmond 1887-1972 D H Eargle 1905-1973 W B Kerr 1930-1973 E R Pohl 1904-1973 H CONTENTS OF VOLUME LXIII Pages Bulletin No 275 A By James 276 B Urban 1A4: 1-8 45-102 9-21 103-320 22-56 Cretaceous Spumellariina from the Great Valley Sequence, California Coast Ranges Upper By Emile A Pessagno, Jr 277 Plates Reexamination of Chitinozoa from the Cedar Valley Formation of Iowa with Observations on their Morphology and Distribution The Tithonian (Jurassic) Ammonite Fauna and Stratigraphy of Sierra Catorce, San Luis Potosi, Mexico By Harish M Verma and Gerd Westermann E G INDEX No separate index is included in the volume Each number is indexed separately Contents of the volume are listed in the beginning of the volume ^-0'^ BULLETINS OF AMERICAN PALEONTOLOGY (Founded 1895) MUS CO MP ZOOL LIBRARY Vol JAN 63 1^73 h >RVAr.D UNIVERSITY No 275 A REEXAMINATION OF GHITINOZOA FROM THE CEDAR VALLEY FORMATION OF IOWA WITH OBSERVATIONS ON THEIR MORPHOLOGY AND DISTRIBUTION By James B Urban 1972 Paleontological Research Institution Ithaca, New York 14850 U S A PALEONTOLOGIGAL RESEARCH INSTITUTION 1971 72 - Daniel President Wakeley Philip C Secretary Rebecca Assistant Secretary S Harris Katherine V W Palmer Director, Treasurer Armand Counsel Representative B Sass W Haas Merrill Vice-President AAAS Adams L John Pojeta, Council Jr Trustees Rebecca Cecil H Kindle (1971-1974) S Ladd (1971-1974) Daniel B Sass (1971-1974) Virgil D Winkler (1969-1975) Kenneth E Caster (1972-1975) D Hoye Eargle (1972-1975) Harris (Life) Axel A Olsson (Life) S Harry Katherine V W Palmer (Life) Donald W Fisher (1967-1973) Merrill W Haas (1970-1973) Philip C Wakeley (1970-1973) BULLETINS OF AMERICAN PALEONTOLOGY and PALAEONTOGRAPHICA AMERICANA Katherine V W Palmer, Editor Mrs Fay Briggs, Secretary Adi'isory Kenneth A E Board Hans Kugl£R Caster Jay Glenn Marks Myra Keen Axel A Olsson Complete titles and price list of separate available numbers may be had on application For reprint, Vols Kraus Reprint Corp., For reprint, poration, HI vol I, Subscription may 16 East 46th St., American Paleontology New see York, N.Y 10017 U.S.A Palaeontographica Americana see Johnson Reprint Cor- Fifth Ave., price of $18.00 per 1-23, Bulletins of New York, N.Y 10003 U.S.A be entered at any time by volume or year, with average volume for Bulletins cana invoiced per issue Purchases ductible from income tax Numbers of Palaeontographica For sale by Paleontological Research Institution 1259 Ameri- in U.S.A for professional purposes are de- Trumansburg Road New York 14850 Ithaca, U.S.A BULLETINS OF AMERICAN PALEONTOLOGY (Founded 1895) Vol 63 No 275 A REEXAMINATION OF CHITINOZOA FROM THE CEDAR VALLEY FORMATION OF IOWA WITH OBSERVATIONS OxN THEIR MORPHOLOGY AND DISTRIBUTION By James B December Urban 6, 1972 Paleontological Research Institution Ithaca, New York 14850 U S A Library of Congress Card Number: 72-8338^- Printed in the United States of America Arnold Printing Corporation CONTENTS Page Abstract Introduction Methods Acknowledgments Paleontology Paleoecology 25 Discussion 26 References cited 29 Plates 33 TABLES Location of sampled sections, Text-figure Location of sample localities, listed Bulletin 277 312 Explanation of Plate 54 All figures natural size Page Figure Corongoceras cordobai Verma and Westermann, n sp 248 El Verde Member, La Caja Formation; Upper Tithonian Whorl fragment, lateral and ventral views 14A, El Verde - J 1526/80) Loc Corongoceras mendozanum (Behrendsen) El Verde Member, La Caja Formation; Upper Tithonian Phragmocone, lateral and ventral views 14A, El Verde 3-4 (McM (McM - J 247 1526/25) Loc Corongoceras ?, n sp indet El Verde Member, La Caja Formation; Upper Tithonian — 251 Phragmocone, lateral and ventral views (McM - J 1511/ 4a-b Phragmocone, lateral and Loc 32, Cieneguita ventral views (McM - J 1504/1) Loc 21, Los Alamitos 3a-b 5) — Durangites cf D heilprini (Aguilera) El Verde Member, La Caja Formation; Upper Tithonian Macroconch phragmocone with remains of body chamber, lateral and ventral views (McM - J 1508/93) Loc 22, Los Alamitos Cast of serpulid attached partly along the umbilical seam 260 Bull Amer Paleont., Vol 63 Plate 54 Bull Amer Paleont., Vol 63 Plate 55 Mexican ammonites: Verma k Westermann Explanation of Plate 313 55 All figures natural size Figure 1-3 Page Micracanthoceras acanthellum Imlay El Verde Member, La Caja Formation; Upper Tithonian la-b Phragmocone with remains of body chamber, lateral and — (McM ventral views - J 252 1508/98) Loc 22, Los Alamitos Durangites cf D alencasteri Verma and Westermann, n sp El Verde Member, La Caja Formation; Upper Tithonian Phragmocone, lateral and ventral views (McM - J 1508/1) 263 Loc 22, Los Alamitos Durangites heilprini (Aguilera) El Verde Member, La Caja Formation; Phragmocone, lateral and ventral views Loc 32, 259 Upper Tithonian (McM - J 1511/2) Cieneguita Serpulid along umbilical seam Durangites aff D heilprini (Aguilera) El Verde Member, La Caja Formation; Upper Tithonian Phragmocone, lateral view (McM - J 1515/8) Loc 19A, Los 5-6 Durangites vulgaris Burckhardt El Verde Member, La Caja Formation; Upper Tithonian 5a-b Macroconch ( $ ) phragmocone, with remains of body chamber, lateral and ventral views (McM - J 1538/1) Loc 20A, Los Alamitos 6a-b Macroconch ( $ ) phragmocone with remains of body chamber, lateral and ventral views 260 Alamitos — 257 — (McM - J 1511/4) Loc 32, Cieneguita Durangites acanthicus Burckhardt El Verde Member, La Caja Formation; Upper Tithonian PMicroconch ), phragmocone with remains of body chamber, lateral and ventral views (McM - J 1517/87) Loc 25, La Leona 256 ( 8-9 Durangites, El n sp aff D rarifurcatus Imlay — Verde Member, La Caja Formation; Upper Tithonian 8a-b Phragmocone, lateral and ventral views (McM - J 1511/ 9a-b Whorl fragment, lateral and 60) Loc 32, Cieneguita ventral views (McM - J 1508/4) Loc 22, Los Alamitos — 262 Bulletin 277 314 Explanation of Plate 56 All figures natural size Figure Page Durangites, n sp aff D rarifurcatus Imlay El Verde Member, La Caja Formation; Upper Tithonian Whorl fragment, lateral and ventral views (McM - J 1517/82) Loc 25, 2-4 La Leona Durangites alencasteri [9 + 262 Verma and Westermann, $] n sp — — — 263 El Verde Member, La Caja Formation; Upper Tithonian 2a-b Holotype, macroconch ( $ ), phragmocone, lateral and ventral views (McM - J 1508/6) Loc 22, Los Alamitos 3a-b Paratype, macroconch ( ), phragmocone, lateral and ventral views (McM - J 1511/11) Loc 32, Cieniguita 4a-b Allotype, microconch ($), phragmocone with impressed remains of body chamber, lateral and ventral views (McM J 1508/7) Loc 22, Los Alamitos Durangites heilprini (Aguilera) El Verde Member, La Caja Formation; Upper Tithonian Phragmocone, lateral and ventral views (McM - J 1536/8) Durangites ?, n sp indet El Verde Member, La Caja Formation; Upper Tithonian Phragmocone, lateral, apertural and ventral views (McM - 259 Loc 16, El Verde J 1511/17) Loc 32, Cieneguita 265 Bull Amer Paleont., Vol 63 Plate 56 INDEX Note: Light face figures refer to page numbers Bold face figures refer to the plate numbers Aulacosphinctes 116, 151, 184, 242 acanthellum, Micra55 131, 134, 149, canthoceras 252 Aulacosphinctoides 116, 122, 134, 138, 145-147, 151, 157, 179, 181-183 acanthicus, B Durangites 55 143, 145, 149, 256 109,110,116, Aguilera, J G 147, 162 (also see Castillo, A D & Aguilera, J G.) 179 aguilari, Perisphinctes alamitocense, Aspidoceras 35 134, 147, 190 alamitocensis, 147,190,191 Aspidoceras cf alamitosense, 35 143,191 Aspidoceras Baker, C L 115 balderus, Perisphinctes 146 balderum, Idoceras cf 146 158, 160 112, 125, 126, 130, 134 Balsas Portal belemnites 123,125-127, 129-132, 134, 135, 144-146, Berriasella 149, 150, 157, 197, 199, 201 alamitosensis, Kossmatia 39, Perisphinctes Rhacophyllites Alencaster, Gloria 40 126, 131, 132, 145, 146,211 146,219 146,219 112,114,142 alencasteri, n sp., Durangites 55, 56 132, 134, 135, 145, 149, 263 alticostatum, Sub- steueroceras Ammonite zones Ammonites bifurcata, Kossmatia 40,41,42 125-127,129132, 134, 135, 145-147, 215 bifurcatus, Hoplites 160, 161 Buchia 115,116 114 Burkart, J burkarti, 48 131, 134, 135, 149, 234 153 147,195 29 143,147,195 Nautilus Physodoceras Burckhardt, C 109, 110, 115117, 120, 156, 158, 160, 203- 115, 167, 196, 197 Andiceras andinum, Aspidoceras 122, 134, 138, 145-147, 151, 242, 245 36 135, 143, 149, 191 apenninicum, 162 Phvlloceras aptychi 112,134 Aptychus Argentina 115 149, 150 W J cajense, Aspidoceras calderoni, California calisto, Hoplites Calliphylloceras Canon Taraises Cantu Chapa, A Haploceras rarinata, Castillo, A D Castillo, A D., Aguilera, J 156 147 109 and G 115,116,117, 150, 156, 160, 142, 145, 146 210 astillerensis, Durangites Aspidoceras 195 147 149,150 146,222 144 123 Rhacophyllites cf Arkell, 205, 253-255 C 36 135, 143, 149, 191 andinum, Aspidoceras 146,215 Boreal Realm 145 162 catorcense, "Paraglochiceras" 122, 134, 135, 143, 147, 149, 151, 152, 190- 195 315 n.sp., ceras 26 143, 147, 172 Substeuero49, 50 129, 131, 132, 134, 135 145, 149, 237 INDEX catorcensis, El Pastor 112, 120, 122, member 121- 123, 125, 127, 128, 132, 134, 138, 143 135, 137, 138, 147, 172 123, 135 116, 117 Haploceras Cieneguita Beds 126 cieneguitense, Aspidoceras Coahuila Peninsula 191 158 section 142 El Verde cohglani, 43 147, 261 147 Hoplites colubrinus, Perisphinctes 146, 147, 183 cf colubrinus, Perisphinctes 147, 183 communis, Virgatosphinctes aff V 34138, 143, 149, 188 114, 249 Cordoba, Ing Diego A cordobai, n sp., Corongoceras 52,53,54125, 126, 129, member Durangites 131, 135, 145, 149, 248 123, 125, 126, 129, 131, 134, 135, 144, 145, 149, 157, 247, Corongoceras 248 Cuba section 132 elimatum, Haploceras cf H 29143, 147, 149, elimatus, cyclotum, Aspidoceras 167 167 Ammonites ellipsostomum, Odontoceras Enay, R 229 114, 150, 151, 156, 211 109, 110 Erben, H K Estacion Catorce Wadley Ethiopian Province Europe 112 112 161 149, 150 exceptionalis, 149, 150 Cutch 120, 131 122, 123, 125, 126, 128-137, 140, 143 124, 128, 129, Hoplites 149 195 Kossmatia 146, 215 43,44, 45, 46 128, 129, 131, 134, 135, 145, 146, 219 densestriatus, Durangites Dichotomosphinctes 257 184 disputabile, Rhacophyllites 219 dolfussi, Perisphinctes Durangites Placenticeras fasciatum, fallax, 147, 167 229,240 Odontoceras felixi, 147, 242 123, 131, 132, 134, 135, 143145, 147, 149, 151, 156, 253257, 259, 260- Perisphinctes 147, 181 fialar, Glochiceras Haploceras Fleming, C A Kear, D 146 146 & 209-211 flexicostata, 263, 265 Kossmatia 44,47 126, 128-131, 135, 145, 221 durangense, Steueroceras 240 Durango 117 flexicostatus, Perisphinctes France 146,221 149 fresnosensis, El Compromiso Mine 119, 126-128, 131, 134 316 Subplanites ?Virgatosphinctes 185 31 138,143,144, 149, 185 INDEX G Geological Map, North-Central incertus, Durangites Indo-Pacific Province 160, 161 Schloenbachia 147 inflata, Mexico Ill 113 158 Sierra Catorce Gerth, E inflatum, Idoceras 256 27138, 143, 149, 176 cf Instituto de Geologia, Universidad Nacional Autonoma de Mexico H (UNAM) Hallam, A Haploceras 151, 160 116, 122, 134, 143-147, 149, 160, 165, 167, 229, 240 36, 37 134, 143, 149, 193 138, 145, 149, haupti, cf Odontoceras interrupta, Kossmatia 221 inversum, Subdichotomoceras, n sp aff S 30,31 125, 130, 134, 172 Aspidoceras 112,114 intercostatum, 183 149 haupti, Aspidoceras Aspidoceras cf A 35 194 35 194 Iraq J heilprini, Durangites Japan 43,54, 149, 232 55,56 131, 132, 134, 135, 147, 259 Durangites aff D 55 Hoplites Hildoglochiceras 260 147 144, 156 Himalayan Province Himalavites Hoplites 161 145 116, 146, 147, 197, 215, 219, 222, 235, 247, 261 Huizachal Formation 112, 115, 118, kellumi, Substeueroceras Kossmatia 222 koeneni, Odontoceras 240 Substeueroceras 158, 240 koeneni tabulatum, n subsp., Substeueroceras 48,49 132, 135, 145, 149, 158, 240 Kossmatia 116, 117, 123, Humboldt, Baron Alexander von Hybonoticeras Idoceras 115 157 116, 117, 122, 138, 143, 146, 149, 153, 157, 233 Kossmatia-DurangitesCorongoceras assemblage 153, 155, 157 Krantz, F 158, 208 La Caja Formation 176-178 Imlay, R W 109, 114, 116, 118,120, 123, 155, 156, 158, 160, 206, 208, 233 139, 142, 145, 146, 150, 151, 156, 202-211, 119 118 Valley 240 kleinsorgensis, La Casita Formation La Gloria Formation 317 112, 121, 129, 136, 115, 123, 132, 137, 118125133, 143, 152 118 118, 119 INDEX La Leona La Luz lamellicostatum, Steueroceras La Purisima Mine Las Catorce (Museum 240 131 112 acanthellum Aptychus 115 Laur, P 115 lauri, 252 Andiceras 147, 179 158, 160 F lenki, Andiceras 43, 51, 52 134, 138, 145147, 242 Perisphinctes 146, 242 Pseudoinvoluticeras cf P 29143, 147, 149, 182 Museum of Paleontology, University of Michigan 114 Museum, longispinus, Ammonites B U.S National mutabile, Idoceras 191 lorioli?, Berriasella cf 147,245 52, 53 134, 138, 145, 147, 245 mozambicum, 27134,138,145- toides 114 123, 145, 151, 156, 252 55 131, 134, 149, monserrati, Perisphinctes 147,179 Perisphinctes AulacosphinC' of Paleontology) Micracanthoceras latus, Leanza, A Michigan, University of 123,134,135 112,128 37,38 125,126,131, (USNM) cf 114, 146, 162 138, 149, 177 141, 149, 199 Los Alamitos 120,122,123, N 126, 131, 132, 134 116,117 beds section 131, 141 Lytoceras potosina 116,142 147 149 112 Mazapil 110,115,117 mazapilensis, Haploceras 116, 117, 122, 156, 160 26 134,146,174 Hoplites Durangites Nikitin, S North America Nothostephanus 149,251 56 149,265 115 150 144, 265 O Odontoceras Olcostephanus 229,240 116, 117, 128, 131, 139 P Pacific Realm 54 125, 129, 131, 149, 157, 247 "Paraglochiceras" 247 149 "Parodontoceras" 146, 174 Pavlow, A Perisphinctes mexicanus, Hoplites Mazapilites 54 161 mexicana, Pulchellia 168 ?n sp indet., mendozanus, Mexican Sea 138, 149, 178 149,161 mendozanum, Corongoceras L 31 146 147 Perisphinctes Mazapilites University (McM) ceras ex gr Neumayria n sp indet., Madagascar Matehuala Mediterranean Province 147,195 neohispanicum, Ido- Corongoceras M mexicanus McMaster Nautilus 146,215 26 134, 146, 174 318 160 122, 134, 143, 144, 147, 149, 172, 173 145, 146, 150, 156, 233, 235 115 146, 147, 179, 181-183, 199, 219, 221, 242, 245 INDEX permulticostatum, Odontoceras phosphoriticum, Aspidoceras Phylloceras S 229,240 195 116, 122, 134, 138, 144, 147, 149, 162, 164 122, 143, 147, Physodoceras 195 Saint-Clair-Duport 115 San Andres Mine 118-120, 126 sanchezi, n sp., Virgato- 37 125, 126, 131, 134, 135, 149, 197 197 147, 167 115 Hoplites Placenticeras fallax plicatilis Ammonites potosina, Kossmatia potosinus, 222 Perisphinctes Aulacosphinc- 147,181,1.82 181, 182 147 Perisphinctes privasensis Ammonites 115, 197 Proniceras Pseudoinvoluticeras Pseudolissoceras 156 122, 143 147, 149 182 122, 129, 134, 145, 149, 151 146,174 128 Mine 112,128 santarosanus, Perisphinctes 221 Schloenbachia 147 Sierra Catorce 112, 115-119, 121-123, 133, 150, 151 Sierra de la Caja Sierra Sombreretillo Simbirskites 47, 48 125, 126, 128131, 135, 149, 222 151, 196 Sokolov, D Spath, L F 115 150,158 Paraglochiceras 26 Phylloceras 25 A Stevens, G R 192 Hoplites Parodontoceras Substeueroceras Subdichotomoceras rarifurcatus, n sp D Real de Catorce Roman, F 237 229,230 240 160 storrsi, Aspidoceras Rhacophyllites 147, 164 stantoni, Steueroceras quemadense, 149, 173 sp juv indet., Substeueroceras aff 120 119 160 Simoceras 122, 151 cf S volanense 37 138, 143, 149, Steuer, Durangites, sp indet., sp., Kossmatia 185 128 Santa Ana Santa Ana de Arriba Mine Santa Ana Silver inflata 28 toides pouzinensis, Pulchellia purisimia, n 32, 33, 34 134, 145, 149, sphinctes cf B 117 110, 115, 156 114, 186 E Sanchez, cf picteti, Berriasella 123426,139 Section San Luis Potosi San Pedro del Gallo 235 235 51 131, 135, 146, 149, 235 122, 125, 130, 134, 138, 145, 149, 183 subfasciatum, 55,56 134,135, 149, 262 112, 114, 115, 118 119, 121, 123, 126-128, 131, 134 Odontoceras 229,240 151,156,185 Subplanites subplicatius, Phyllo- ceras cf P 25 134, 138, 149, 162 subprivasensis, Ber- 116 151 319 riasella 38 126, 129-132, 135, 149, 199 INDEX Virgatosphinctinae 168 subrasile, Neumayria Substeueroceras 123, 129, 132, 134, 145-147, 150, 156, 131, 135, 149, 158, 228-235, 237, Beds 120,122,125, assemblage 126, 133, 138, 142, 151 153, 157 volanensis, Ammonites 240 Substeueroceras- 196 vulgaris, Durangites Berriasella assemblage 55 131, 132, 134, 153, 155, 157 110, 115 Symon 135, 145, 149, 257 W Wallace, Tamaulipas Peninsula Taraises Formation L Weaver, C E Windhausen, 158 112, 115, 118120, 123, 125, 126, 128, 129, 115 58 158 A 131-134 tenuistriata, Kossmatia Tethyan Realm Tierras Negras zacatecana, Berria- 202 sella aff 160, 161 112, 138, 139 Torquatisphinctes transatlanticum ?, Haploceras 201 zacatecanum, Aspidoceras 26 134, 144, 149, 165 Ziess, 195 114,151 A zitteli, transitorius, Neumayria 168 Pseudolissoceras 26 129, 134, 145, 149, 151, 168 115 146, 179 Perisphinctes 39125,126,131, 134, 135, 149, 184 Ammonites B Zone of U Uhlig, Berriasella chaperi B delphinensis V 160,202 Corongoceras United States National Museum (USNM) 114, 146, 162 "Kossmatia" pseudodesmidoptycha K tenuistriata Pseudolissoceras 149, 162 V velledoe, Virgatosphinctes 147, 164 157 Substeueroceras koeneni Virgatosphinctes 158 157 158 V transitorius 120 160, 185 122, 134, 138, 143-145, 149, 151, 166, 157, 160, 185, 188 158 158 zitteli mendozanus Phylloceras Virgatites 157, 158 alternans Universidad Nacional Autonoma de Mexico (UNAM) 112,114,146, Vereda del Quemado 158 158 Windhauseniceras internispinosum Zonal correlation Zuloaga Limestone 320 157 157 115, 118-120, 123, 125, 126, 128, 132, 134 Vols BULLETINS OF AMERICAN PALEONTOLOGY I-XXIIL See Kraus Reprint Corp., 16 East 46th St., New York, N Y 10017, U.S.A XXIV XXV XXVI (Nos 80-87) 334 pp., 27 pis Mainly Paleozoic faunas and Tertiary Mollusca 12.00 (Nos 88-94B) 306 pp 30 pis Paleozoic, Mesozoic, and Miocene 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polychaetes, ammonites (No 218) 1058 pp., pis Catalogue of the Paleocene and Eocene Mollusca of the Southern and Eastern United States (Nos 219-224) 671 pp., 83 pis Peneroplid and Australian forams North American carpoids, South Dakota palynology, Venezuelan Miocene molluska Valuta 18.00 18.00 18.00 L (Nos 225-230) 518 pp., 42 pis 18.00 Venezuela aAd Florida cirripeds, Antarctic forams, Linnaean Olives, Camerina, Ordovician conodonts, Niagaran forams 420 pp., 10 pis (Nos 231-232) Antarctic bivalves, Bivalvia catalogue 18.00 _ „ (Nos 233, 236) 387 pp., 43 pis New Zealand forams, Stromatoporoidea, Indo-Pacific, Miocene-Pliocene California forams 18.00 LIII (Nos 237-238) 488 pp., 45 pis Venezuela Bryozoa, Kinderhookian Brachiopods 18.00 LIV (Nos, 239-245) 18.00 LI LII 510 pp., 50 pis Dominican ostracodes, Texan pelecypods, Wisconsin raollusks, Siphocypraea, Lepidocyclina, Devonian gastropods, Miocene Pectens Guadaloupe LV LVI LVII LVIII LIX LX (Nos 246-247) 657 pp., 60 pis Cenozoic 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Areas, Lutetia, rudistids and venerids II (Nos 6-12) „ 531 pp., 37 pis Heliophyllum halli Tertiary turrids, Neocene Spondyli, Paleozic cephalopods, Tertiary Fasciolarias and Paleozoic and Recent Hexactinellida 23.00 III (Nos 13-25) 513 pp., 61 pis Paleozoic cephalopod structure and phylogeny, Paleozoic siphonophores, Busycon, Devonian fish studies, gastropod Carboniferous crinoids, Cretaceous jellyfish, studies, Platystrophia and Venericardia 28.00 IV (Nos 26-33) 492 pp., 72 pis Rudist studies Busj'con, Dalmanellidae Byssonychia, Devonian lycopods, Ordovican eurypterids Pliocene mol- 28.00 lusks V 3^ (Nos 34-47) 445 pp., 101 pis 32.00 Tertiary Arcacea, Mississippian pelecypods, Ambonychiidae, Cretaceous Gulf Coastal forams VI (Nos 38-41) 444 pp., 83 pis Lycopsids and sphenopsids of Freeport Coal, Venericardia, Carboniferous crinoids, Trace fossils 35.00 VII 257 pp., 58 pis (Nos 42-45) Torreites Sanchezi, Cancellariid Radula, Ontogeny, sexual dimorphism trilobites, Jamaician Rudists 23.50 ... the volume Each number is indexed separately Contents of the volume are listed in the beginning of the volume ^-0'^ BULLETINS OF AMERICAN PALEONTOLOGY (Founded 1895) MUS CO MP ZOOL LIBRARY Vol. .. Palaeontographica Americana see Johnson Reprint Cor- Fifth Ave., price of $18.00 per 1-23, Bulletins of New York, N.Y 10003 U.S.A be entered at any time by volume or year, with average volume for Bulletins. .. virtually variation of the all number Chitinozoa of discs in the prosome of different individuals could be a result of the stage of the reproductive process Occurrence of two types of prosomes in