. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. REVISION OF LATE VALANGINIAN CEPHALOPODA 299. Fig. 152. Olcostephanus {Olcostephanus) glaucus Spath (?). The holotype from the Spiti Shales of Pakistan, (after Spath 1939). x 1. As can be seen from Fatmi's (1977) figure and description, Olcostephanus (Rogersites) madagascariensis var. isakhelensis Fatmi is a junior subjective synonym of the microconch of this taxon. Olcostephanus glaucus Spath (1939) (Fig. 152) diners from the present species in being less inflated, more finely and densely ribbed and
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. REVISION OF LATE VALANGINIAN CEPHALOPODA 299. Fig. 152. Olcostephanus {Olcostephanus) glaucus Spath (?). The holotype from the Spiti Shales of Pakistan, (after Spath 1939). x 1. As can be seen from Fatmi's (1977) figure and description, Olcostephanus (Rogersites) madagascariensis var. isakhelensis Fatmi is a junior subjective synonym of the microconch of this taxon. Olcostephanus glaucus Spath (1939) (Fig. 152) diners from the present species in being less inflated, more finely and densely ribbed and, in the holo- type, lacking constrictions. The constricted paratype (Spath 1939, pi. 6 (fig. 7)) is very close, however, to the microconch of the present variant, and may prove to be identical. Collignon (1962: 44) considered O. ankaranensis (Fig. 153) to be characterized by '. . ses tours subcylindriques dont l'epaisseur reste a peu pres constante, la reduction des flancs qui sont limites a la partie garnie de tubercules ombilicaux, et par un ombilic profond et tres large'. So far as the writer is able to judge, there are no features whereby this species can satis- factorily be separated from the microconch of the present form, of which O. ankaranensis (Collignon) thus becomes a probable junior subjective 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
