. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 252 ANNALS OF THE SOUTH AFRICAN MUSEUM Discussion The writer would agree with Spath (1939: 19) that this species should include the adult figured by Uhlig (1903: 394, pi. 78 (fig. 1)) as Holcostephanus (Astieria) cf. convoluta von Koenen (Figs 93-94). Since, however, Uhlig's specimen was subsequently made the type of the new species H. uhligi Collignon, the latter name becomes a junior subjective synonym of O. fascigerus. Although Spath (1939) and Fatmi (1977) mention constrictions in their discussio
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 252 ANNALS OF THE SOUTH AFRICAN MUSEUM Discussion The writer would agree with Spath (1939: 19) that this species should include the adult figured by Uhlig (1903: 394, pi. 78 (fig. 1)) as Holcostephanus (Astieria) cf. convoluta von Koenen (Figs 93-94). Since, however, Uhlig's specimen was subsequently made the type of the new species H. uhligi Collignon, the latter name becomes a junior subjective synonym of O. fascigerus. Although Spath (1939) and Fatmi (1977) mention constrictions in their discussions of O. fascigerus, none of the figured material shows parabolae and it is herein assumed that parabolae are lacking in the present interpretation of this species. Olcostephanus fascigerus can be distinguished from all other macroconch dimorphs occurring in the Sundays River Formation by the weak inflation of the whorls which provides it with a cylindrical aspect in ventral view, its promi- nent umbilical bullae and its fine, irregular secondary ribbing. Occurrence This species is at present recorded only from northern Pakistan, Mada- gascar, and South Africa. Olcostephanus {Olcostephanus) afT. durangensis (Cantu Chapa) (6*) Figs 99-100 Hoplites symonensis Bose, 1923: 96, pi. 5 (figs 5-16). Taraisites durangense Cantu Chapa, 1966: 16. Material Two microconchs, SAM-PCU1547, 1549, collected in the Algoa Brick & Tile quarries at Coega (see Fig. 1).. Fig. 98. Olcostephanus {Olcostephanus) durangensis (Cantu Chapa). The syntypes from the Taraises Formation of northern Mexico, of which the smaller specimen is herein selected as lectotype (after Bose 1923). x 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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