. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 23 Only one specimen, Dl 158/1 (Fig. 7E) has faint traces of ribbing over the venter; all the other specimens are perfectly smooth, both on the shell surface and on internal moulds. One specimen, Dl 158/3 (Fig. 7B-C)—a body chamber with part of the last two septa preserved, is identical to the above specimens except that it has distinct, crescentic lateral ribs, which appear to originate in a curved, dorso- lateral tubercle. Unfortunately we cannot determine on the
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 23 Only one specimen, Dl 158/1 (Fig. 7E) has faint traces of ribbing over the venter; all the other specimens are perfectly smooth, both on the shell surface and on internal moulds. One specimen, Dl 158/3 (Fig. 7B-C)—a body chamber with part of the last two septa preserved, is identical to the above specimens except that it has distinct, crescentic lateral ribs, which appear to originate in a curved, dorso- lateral tubercle. Unfortunately we cannot determine on the basis of this speci- men whether this ribbing is restricted to the body chamber, or is also present on the phragmocone. The suture is partially exposed in Dl 158/4 (Fig. 8A) and Dl 158/3 (Fig. 8B), showing very simple, open subquadrate saddles and lobes. u. 0 5 J B U. 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
