The Cambridge natural history . ristic West African forms{Pseudachatina, Streptostele, Perideris) diminish or are absentaltogether. No Helix and only 1 Cyelophorus occur. Ovariipo, Daniara, and Great Namaqualand, lying Ijetweenthe Cuniene and Orange rivers, seem to form a transitiondistrict between the West and South African faunas. Helixreappears, while the characteristic West African genera arealmost entirely wanting. {c) The East African Province extends from about DelagoaBay to the Al)yssinian shores of the Ked Sea. In general out-line the province consists of a flat marshy district, exten
The Cambridge natural history . ristic West African forms{Pseudachatina, Streptostele, Perideris) diminish or are absentaltogether. No Helix and only 1 Cyelophorus occur. Ovariipo, Daniara, and Great Namaqualand, lying Ijetweenthe Cuniene and Orange rivers, seem to form a transitiondistrict between the West and South African faunas. Helixreappears, while the characteristic West African genera arealmost entirely wanting. {c) The East African Province extends from about DelagoaBay to the Al)yssinian shores of the Ked Sea. In general out-line the province consists of a flat marshy district, extendinginland for many miles from the sea; this is succeeded by risingground, which eventually becomes a high table-land, oftendesolate and arid, whose line of slope lies parallel to the trend ofthe coast. The Mollusca are little known, and have only beenstudied in isolated districts, usually from the discoveries ofexploring expeditions. The Mozambicpue District, from Delagoa Bay to Cape Delgado, EASTERN AFRICA THE GREAT LAKES 331. includes no genus which does not occur on the west coast, exceptCyclostoma (2 sp.) TrocJionanina (4 sp.), Urocyclus, a character-istic African shig (2 sp.), Rachis (6 sp.), Fachnodus (2 sp.), andAchatina (5 sp.), are the principal groups. Fig. 218. — Urocyclus coviorensisFiscli., Comoro Is. : G, Gen-erative oritice ; M, mucusgland ; 0, oiitice leading tointernal sliell ; P, pulmonaryorifice ; T, tentacles. (AfterFischer. I The Zanzibar iJlsfrict, from Cape Delgado to the Somalicountry, has the same general featm-es. Meladovms, a largesinistral AmjmUaria, is characteristic, while Cyclostoma (5 sp.)becomes more abundant. Hdix is still absent, but the carnivor-ous forms {Streptaxis 2 sp., Ennea 7 sp.) are rather numerous. The Somali District is characterised by operculate groups ofthe Otopoina type {Georgia, Rochehrunia, Revoilia) whose genericvalue is rather doubtful. Petraeus, in an Arabian type, sup-plants Rachis and PacJinodus. Achatina is nearly wan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
