The Cambridge natural history . province. Thus in Socotra there are two Cyrlo-topsis, in Abyssinia two Africario7i (closely related to the IndianGiTasia), two Microcystyis, and a Glessida, and in the Scioa dis-trict there is a Sitfda. The fresh-water Mollusca of Socotra areIndian forms. (2) The South African Sub-region.—The principal charac-teristic of the Mollusca of S. Africa isthe occurrence of numerous small speciesof Helicidae, belonging chiefly to thegroups PcUa, Fhasis, Dorcasia, aiulScidptaria, all of which are practicallypeculiar. Carnivorous genera are alsoprominent, Ennca here attai
The Cambridge natural history . province. Thus in Socotra there are two Cyrlo-topsis, in Abyssinia two Africario7i (closely related to the IndianGiTasia), two Microcystyis, and a Glessida, and in the Scioa dis-trict there is a Sitfda. The fresh-water Mollusca of Socotra areIndian forms. (2) The South African Sub-region.—The principal charac-teristic of the Mollusca of S. Africa isthe occurrence of numerous small speciesof Helicidae, belonging chiefly to thegroups PcUa, Fhasis, Dorcasia, aiulScidptaria, all of which are practicallypeculiar. Carnivorous genera are alsoprominent, Ennca here attaining itsmaximum. lihyfida (to which severalspecies still regarded as Fella belong) iscommon only to the S. racific and Aus-tralasia, and forms, with Isidora amongthe fresh-water pulmonates, a remarkableliid< (if connexion. Aeropc, the largest(jf all helicoid carnivorous genera, andChlamydepliorus, a carnivorous slug withan internal sliell, are peculiar. Achatinais still abundant, but Liviicolaria is wanting. Lichdtacca, a. Fk;. 221.—AcJmtma zebraLam., S. Africa, x ^. 334 SOUTH AFRICA—ST. HELENA form with a continuous peristome, perhaps akin to Bulimus;Apera, a form of slug; and Goeliaxis, a genus perhaps akin tothe Papuan and Queensland Perrieria, are all peculiar. Theland operculates, which are not numerous, are of the EastAfrican type. Land Mollusca of the S. African Sub-region. Chlamj-depliorus 1 Vitrina EnneaAerope .Rhytida . .Helicaiion .TrochonaiiinaTrochozoiiitesLi max .Apera 31 Nauiiia5 Conuhis Patula .Pella . .Dorcasia .PhasisSculptaria 7 Helix (inc. sed.) 4 ?Stenogyra . 4 6 Eachis2 Pachnodns 1 Goeliaxis3 Succinea 244 Buliminus (?)Pupa .Vertigo . . 4 202 181 Vaginula .CyclophorusCyclostoinaCyclotus (S)Blanfordia . St. Helena.—The MoUuscan fauna of St. Helena is perhapsthe most puzzling, as regards its geographical affinities, of any inthe world. It consists of 29 peculiar species of land Mollusca(fresh-water species being unknown), 19 of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
