Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . 00 I. I CRETACEOUS FAUNAS FROM SOUTH AFRICA 265 chamber, ribbing becomes more prominent again. In some specimens, (Fig. 209) or SAS-A2084, distinct tuberculation develops on thebody chamber, which acquires a distinct Texanites-likQ appearance. Spacingof ribbing on the body chamber, however, is variable. Specimens SAS-Z1756(Fig. 208), SAS-76/1 (Fig. 205) and SAM-PCP5717 (Fig. 207) lack lateraltuberculation on the body chamber and may be regarded as being most Sub-mortoniceras-like in this respect. The ven
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . 00 I. I CRETACEOUS FAUNAS FROM SOUTH AFRICA 265 chamber, ribbing becomes more prominent again. In some specimens, (Fig. 209) or SAS-A2084, distinct tuberculation develops on thebody chamber, which acquires a distinct Texanites-likQ appearance. Spacingof ribbing on the body chamber, however, is variable. Specimens SAS-Z1756(Fig. 208), SAS-76/1 (Fig. 205) and SAM-PCP5717 (Fig. 207) lack lateraltuberculation on the body chamber and may be regarded as being most Sub-mortoniceras-like in this respect. The venter is distinctly unicarinate throughout, except in SAS-Z1880(Fig. 202) where the external (5) row of tubercles becomes elongated on theinner whorls at a diameter of c. 80 mm, thus creating the appearance of twolateral keels. On the body chamber of this specimen, however, the external (5)tubercles are distinctly separate, and the venter unicarinate. The suture is variable, ranging from wide, blocky saddles and lobes as inSAS-Z1880 (Fig. 201), to long, narrow, thin-stemmed saddl
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
