Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 28. Tropaeum subsimbirskense compressum (Sinzow, 1905). SAS EMI 10 from ManyolaDrift, Zululand, Aptian III. x 0,25. normal ribs which may bi- or trifurcate at the umbilical edge. Towards the endof the phragmocone the major ribs become stronger. The beginning of the bodychamber is marked by a very strong, low broad rib. From here onward, as far asthe aperture, ornament consists solely of ten widely spaced, initially low, broadribs; the intercalatories having disappeared completely. Towards the aperture,the last fo
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . Fig. 28. Tropaeum subsimbirskense compressum (Sinzow, 1905). SAS EMI 10 from ManyolaDrift, Zululand, Aptian III. x 0,25. normal ribs which may bi- or trifurcate at the umbilical edge. Towards the endof the phragmocone the major ribs become stronger. The beginning of the bodychamber is marked by a very strong, low broad rib. From here onward, as far asthe aperture, ornament consists solely of ten widely spaced, initially low, broadribs; the intercalatories having disappeared completely. Towards the aperture,the last four or five major ribs become progressively flared and narrower on theflanks, and also closer spaced. The first three to four major ribs on the bodychamber are restricted to the flanks, but towards the aperture, as they becomeincreasingly flared, they bifurcate at the ventral edge and cross the venter as CRETACEOUS FAUNAS FROM SOUTH AFRICA 263. Fig. 29. A-B. Tropaeum subsimbirskense compressum (Sinzow, 1905): SAS EMI 10 fromManyola Drift, Zululand, Aptian III. x 0,34. 264 ANNALS OF THE SOUTH AFRICAN MUSEUM very low, broad looped folds. The last three or four ribs before the aperture arethe most prominent, being thin and flared on the flanks and broad and high overthe venter. Part of the aperture is preserved. It appears to have been simple, andsomewhat constricted. The suture is very incised and dentritic, consisting of a trifid L, U and lateral lobe is largest and occupies virtually the whole of the flank (seeFig. 87). Dimensions Specimen D Wb Wh WbjWh U SASEM110 510 140(27) 151(29) 0,93 222(43) 390 109(27) 139(35) 0,80 163(44) Discussion The main characteristic features of the phragmocone of this species are thewhorl section, with little-inflated flanks, converging to a narrow dorsum (seeForster 1975a, text-fig. 29), and the more or less straight, rursiradiate the body chamber, the low, major costae, separ
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Keywords: ., bookcentury1800, bookdecade1890, booki, booksubjectnaturalhistory
