. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 196. Olcostephanus {Olcostephanus) balkanicus (Tzankov). The syntypes from the Lower Hauterivian of Bulgaria (after Tzankov 1943). x 3. Olcostephanus globosus Spath, of which O. pachycyclus Spath represents an early growth stage (Fatmi 1977), is a macroconch species which is undoubtedly close to O. perinflatus. Indeed, it would seem to differ from Matheron's (1878) illustration only in its larger adult size, a character which is possibly environmentally related and hence doubtfully of specific i
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 196. Olcostephanus {Olcostephanus) balkanicus (Tzankov). The syntypes from the Lower Hauterivian of Bulgaria (after Tzankov 1943). x 3. Olcostephanus globosus Spath, of which O. pachycyclus Spath represents an early growth stage (Fatmi 1977), is a macroconch species which is undoubtedly close to O. perinflatus. Indeed, it would seem to differ from Matheron's (1878) illustration only in its larger adult size, a character which is possibly environmentally related and hence doubtfully of specific importance. However, the Pakistan material is retained as distinct until Matheron's (1878) species is restudied on the basis of type and topotype material. Olcostephanus balkanicus (Tzankov) (Fig. 196) is based upon a strongly inflated nucleus which seems to differ from the inner whorls of O. perinflatus, that is from O. stephanophorus, in having a much wider umbilicus, somewhat fewer (15-17) umbilical bullae and distinctly prorsiradiate secondaries. How- ever, it shows prominent parabolae. Occurrence Olcostephanus perinflatus is at present known with certainty only from the south of France, but it may also be present in South Africa and 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
