. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 342 ANNALS OF THE SOUTH AFRICAN MUSEUM Olcostephanus perinflatus (Matheron) Spath, 1939: 23. Fatmi, 1977: 270. Olcostephanus cf. perinflatus (Matheron) Spath, 1939: 25, pi. 6 (fig. 6). Material Two specimens, AM-4292b, and PEM-1468/89, the latter a mere fragment, both preserved as internal moulds. Holotype The original of Matheron's (1878) plate 20B (fig. 8a-b) (Fig. 194 herein) from the south of France. Description The shell of AM-4292b is an extremely inflated, globose, cadicone, with a very narrow
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 342 ANNALS OF THE SOUTH AFRICAN MUSEUM Olcostephanus perinflatus (Matheron) Spath, 1939: 23. Fatmi, 1977: 270. Olcostephanus cf. perinflatus (Matheron) Spath, 1939: 25, pi. 6 (fig. 6). Material Two specimens, AM-4292b, and PEM-1468/89, the latter a mere fragment, both preserved as internal moulds. Holotype The original of Matheron's (1878) plate 20B (fig. 8a-b) (Fig. 194 herein) from the south of France. Description The shell of AM-4292b is an extremely inflated, globose, cadicone, with a very narrow, deep, crater-like umbilicus. The umbilical walls are steep, convex, and slightly overhanging, and ornamented with about 22 rursiradiate primaries terminating in small bullae on the umbilical shoulder. The latter give rise to 3-4 rather fine, slightly prorsiradiate secondaries, which on the outer whorl are slightly flexuous, and between which are generally a single intercalated rib. Very occasionally a secondary rib is seen to bifurcate on the flanks, so that there are about 50-60 secondaries per half whorl on the outer whorl. Parabolae are absent on the outer whorl, but it is unknown whether they occur on the inner whorls. Discussion As suggested by Kilian (1892), the writer believes Ammonites stephanophorus Matheron (Fig. 195) merely to represent the juvenile growth stages of Olco- stephanus perinflatus. The Uitenhage specimens are only tentatively referred to Matheron's species because of uncertainty as to what O. perinflatus really looks like, since it has never been photographically refigured or redescribed and there is reason to believe that Matheron's (1878) illustration may be some- what Fig. 195. Olcostephanus {Olcostephanus) perinflatus (Matheron) ($). The holotype of Olcostephanus stephanophorus (Matheron) from the south of France, a juvenile (after Matheron 1878). x Please note that these images are extracted from scanned page images that may have b
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
