. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . ack in its origin to some of theearliest explorations in the African interior. It was,in fact, Speke, during Burtons celebrated expedition toTanganyika, who originally picked up the shells of some ofthe above types on the beach, and two of these particularspecimens, after finding their way into the British Museum,were described by S. P. Woodward * under the titles of * S. p. Woodward, Proceedings of the Zoological Society, 1S57. THE TANGANYIKA PROBLEM. 219 Nassopsis
. The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . ack in its origin to some of theearliest explorations in the African interior. It was,in fact, Speke, during Burtons celebrated expedition toTanganyika, who originally picked up the shells of some ofthe above types on the beach, and two of these particularspecimens, after finding their way into the British Museum,were described by S. P. Woodward * under the titles of * S. p. Woodward, Proceedings of the Zoological Society, 1S57. THE TANGANYIKA PROBLEM. 219 Nassopsis iiassa, and LithoglypJms zonahis, the firstbeing supposed at the time to represent an aberrant formof the great tropical and sub-tropical family the Me-laniadcE. Although nothing whatever but the shell wasin his hands at the time, Woodward went further thanthis in the determination of the relationships of thesemolluscs, relegating Nassopsis to the sub-genus of theMelaniadce, Melanella. Subsequently, in 1880, a muchmore extensive collection of shells was brought to Englandby the captain of the small steamer which the London.
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