... Series 199 8-2,1-21.SARJEANT, W. A. S. 199 9. Obituary: Charles Downie( 192 3- 199 9). Acritarch Newsletter, no. 15, 4-8.SARJEANT, W. A. S. 2000. Charles Downie ( 192 3- 199 9) and his ... Sclerites, spicules and sys-tematics: the researches of Marthe Deflandre-Rigaud ( 190 2- 198 7). Micropaleontology, 37, 191 - 195 SARJEANT, W. A. S. 199 20. Gideon Mantell and the "Xanthidia". ... expanded tocomprise Silurian microfloras from that county( 195 9, 196 3), Early Cambrian and late Precam-brian acritarchs from Scotland and the GrandCanyon, Colorado ( 196 2, 196 9),...