... occnrs both in the npper part of the Lower Volgian and the lower part of the Upper Volgian. NIKITIY recorded Perisphinctes St,sclrurozt.skii from tho Sodigor Zonc of the Uppcr Volgian (1884, ... of the section on page 8) of Lowcr Volgian age; and an Upper IIartzfjdd Sandstone, of early Cretaceolis date, comprising the remainder of the formation. In south-western Jameson Land the ... fact, the ornament of most of the examples of Praetollia rnaynci, the type species, is like that of the inner whorls of Tollia and we do not know whcthcr the specimens were adults or the...