. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 185. Olcostephanus (Olcostephanus) scissus (Baumberger). The holotype, by lectotype designation herein, from the Swiss Jura (after Baumberger 1907). x € \ Fig. 186. Olcostephanus (Olcostephanus) sub- filosus Spath. The holotype from Speeton, Yorkshire (after Pavlow & Lamplugh 1892). x 0,5. There are two distinct, oblique parabolae on the outer whorl. This species seems to be based upon a juvenile of O. sayni, although the presence of para- bolae have still to be proven on the inner whorl
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 185. Olcostephanus (Olcostephanus) scissus (Baumberger). The holotype, by lectotype designation herein, from the Swiss Jura (after Baumberger 1907). x € \ Fig. 186. Olcostephanus (Olcostephanus) sub- filosus Spath. The holotype from Speeton, Yorkshire (after Pavlow & Lamplugh 1892). x 0,5. There are two distinct, oblique parabolae on the outer whorl. This species seems to be based upon a juvenile of O. sayni, although the presence of para- bolae have still to be proven on the inner whorls of the latter species. Olcostephanus symonensis (Bose) (Fig. 188) was distinguished from O. astieriformis by its finer, more numerous secondaries with 60 in a space where O. astieriformis shows only 45. It is, therefore, close to O. potosinus, as well as resembling O. sayni in the frequent bifurcation of secondary ribs. With revision, it seems likely that Bose's (1923) species will fall into synonymy. There is in the Natural History Museum in Paris a cast of the original of Paquier's (1900) Holcostephanus variegatus (Fig. 189). It shows the original to. 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
