248 
GEOLOGICAL EXPLORATION 
to recent species, and associated with hard and soft limestones, 
calcareous sandstones, and conglomerates, which had been 
collected by the lecturer, and he had determined them as 
follows : 
Ampullaria ovata (?) (Olivier). — Locality — Lak Buna. 
Distribution — -Recent : Victoria Nyanza, Tanganyika, 
Nile, Post-Pliocene : Egypt. Miocene : Victoria Nyanza. 
Melania tuber culata (Muller) ( curvicosta , Deshay es). — Locali- 
ties — Archer’s Post, Lak Buna, Chukali Ghofu. 
Distribution — Recent : Nile, Rudolf, Nyasa, Tanganyika, 
India, &c. Post-Pliocene : Egypt and Sahara. Pliocene : 
Lake Assal, French Somaliland (formerly regarded as Abys- 
sinia). Miocene : Rudolf (Omo river), Greece, North Italy, &c. 
Cleopatra bulimoides (Olivier). — Localities — Lak Buna ; 
Chukali Ghofu. 
Distribution — Recent : Nile, Rudolf, French Somaliland, 
Zanzibar. Post-Pliocene: Egypt. Pliocene: French Somali- 
land. Miocene : Victoria Nyanza. 
Bithynia and Planorbis, spp. — Locality — Wajhir. 
Limicolaria rectistrigata (E. A. Smith). — Locality — Archer’s 
Post. 
Distribution — Recent : Rudolf and Tanganyika regions. 
Bhachis Rhodotcenia (Martens). Locality — Chukali Ghofu. 
Distribution — Recent : Victoria Nyanza and Mount Kenya 
plateau. 
Leptospatha spathuliformis (Bourguignat). — Localities — 
Turbi and Lak Bana. 
Distribution — Recent : Rudolf and Zanzibar. 
Corbicula fluminalis (Muller) ( saharica , Fischer). — Localities 
— Turbi, Lak Buna, and Chukali Ghofu. 
Distribution — Recent : Nile, Rudolf, Marguerite, and 
Abyssinia. Post-Pliocene : Egypt and Sahara. Pliocene : 
French Somaliland. Miocene : Rudolf (Omo river beds). 
Corbicula radiata ( pusilla ?), Philippi. Locality — Chukali 
Ghofu. 
Distribution — Recent : Nile, Rudolf, Victoria Nyanza, 
Albert Edward, Nyasa, Tanganyika. Post-Pliocene, Egypt. 
Pliocene : French Somaliland. Miocene : Rudolf (Omo river 
beds). 
