The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . The Melania admirabilis of Lake Tanganyika. other than the gastropods can be readily fitted in with thissomewhat startling indication that Tanganyika practicallyrepresents an old Jurassic sea. The facts upon this headare somewhat meagre, but they are certainly not withoutsignificance. Thus the ganoid polyptcrus at least hadallies in the Jurassic seas. Most of the teleostian fishesappear to have arisen later, but they probably had emergedabout that time, and we obviousl
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . The Melania admirabilis of Lake Tanganyika. other than the gastropods can be readily fitted in with thissomewhat startling indication that Tanganyika practicallyrepresents an old Jurassic sea. The facts upon this headare somewhat meagre, but they are certainly not withoutsignificance. Thus the ganoid polyptcrus at least hadallies in the Jurassic seas. Most of the teleostian fishesappear to have arisen later, but they probably had emergedabout that time, and we obviously need not suppose thatthe lake would become suddenly cut off from a westernocean. The prawns, crabs and jelly-fishes of the halolimnicgroup are all forms which might very well have belongedto a Jurassic series, while the sponge Potamelepus is not 354 THE TANGANYIKA PROBLEM. without interest in this connection ; for the spicules of thisgenus are highly peculiar (see Chap. XV.), and are quiteindistinguishable from the old marine genus Renieria,common in the Silurian epoch. There is thus obviouslynothing in the character o
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