. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 85 Coiling on the inner whorls is very variable, ranging from open crioceratitid with the whorls not touching at all, as in PCZ8447 (Fig. 30E), through slightly less open with only the third whorl being detached from the preceding one, as in PCZ8425b (Figs 16, 31F-I), to close crioceratitid, as in PCZ8433 (Fig. 31J), PCZ8424a-b (Fig. 32A), C80056, and C80055 (Fig. 6A-B). The ventral spines of one whorl generally touch a shallow impressed zone of the preceding whorl
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 85 Coiling on the inner whorls is very variable, ranging from open crioceratitid with the whorls not touching at all, as in PCZ8447 (Fig. 30E), through slightly less open with only the third whorl being detached from the preceding one, as in PCZ8425b (Figs 16, 31F-I), to close crioceratitid, as in PCZ8433 (Fig. 31J), PCZ8424a-b (Fig. 32A), C80056, and C80055 (Fig. 6A-B). The ventral spines of one whorl generally touch a shallow impressed zone of the preceding whorl, but the main surface of the dorsum and venter do not seem to have been in contact. This appears also to be the case in later whorls, the dorsum of which is also impressed, and which also shows what appear to be depressions to house spines ( Fig. 10D). The whorl section varies from compressed to depressed, with the greatest breadth at the umbilical spine. In general, ornament is strongest in inflated indi- viduals and weakest in compressed ones; it will be convenient to describe the species in these B. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
