484 Bulletin American Museum of Natural History [Vol. LIIT 
The following genera may be regarded as typically East African, 
although some of them have a few representatives in the extreme eastern 
portion of the West African Subregion: 
Helicidee Colpanostoma 
Halolimnohelix Bloyetia 
Vicaruhelix Hamya 
Haplohelix Vitrinide 
Achatinidee Vitrina 
Limicolarvopsis Enide 
Krapfiella Cerastus 
Subuliniscus Pomatiaside 
Mabiliella Tropidophora 
Streptaxide Otopoma 
Taylorva 
83. Souru ArricaNn SuBREGION.—The limits of this subregion are 
somewhat uncertain on account of the scarcity of data for its northern 
boundary, where very little collecting has been done. Roughly we take 
the Limpopo River in the east, though on the coast the East African Sub- 
region probably penetrates to Delagoa Bay, and in the high interior the 
South African may extend some distance into Matabeleland. In the 
arid central and western veldt districts, the Tropic of Capricorn is taken 
in the absence of definite boundary. Toward the coast of the Atlantic 
the South African. forms run farther north in Damaraland, probably 
about to 21° southern latitude. It should be noted that our South African 
Subregion in no way coincides with the Southwestern Cape Region gen- 
erally accepted by botanists, which covers but the southwestern part of 
Cape Colony (see the botanical map of Africa, after Engler, in J. Bequaert, 
1918, Bull. Amer. Mus. Nat. Hist., N. Y., XX XIX, p. 19). . 
Genera restricted to the South African Subregion are as follows: 
Acavidee (Dorcasiinz) Natalina Trachycystis 
Dorcasia : Aperide . — Sculptariat 
Trigonephrus Apera Clausiliidee 
Tulbaghinia Zonitide Austrobalea 
Achatinidee Kerkophorus Pupillids 
Metachatina Microkerkus Fauculus 
Cochlitoma Arionidee (?) Cyclophoridz 
Hypolysia Oopelta Chondrocyclus 
X erocerastus Endodontidz Amnicolids 
Celiaxis Afrodonta Tomichia 
Rhytididee Phortion 
1Family uncertain. 
