The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Chytra kirkii, upper, compared with a marine Jurassic onitstus, lower. by an Oolitic fossil genus Purpuroidia, from which it isvery difficult, if not impossible, on conchological grounds,to distinguish it. From these comparisons it will be seenthat we have numerous genera of gastropods belonging tothe halolimnic series of Tanganyika, which are concho-logically indistinguishable from an equal number character-istic of the Oolite seas, and it will certainly be admittedth
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Chytra kirkii, upper, compared with a marine Jurassic onitstus, lower. by an Oolitic fossil genus Purpuroidia, from which it isvery difficult, if not impossible, on conchological grounds,to distinguish it. From these comparisons it will be seenthat we have numerous genera of gastropods belonging tothe halolimnic series of Tanganyika, which are concho-logically indistinguishable from an equal number character-istic of the Oolite seas, and it will certainly be admittedthat in this method of stating the fact we do not, in reality,do justice to the comparison at all, for it is unquestionably a THE TANGANYIKA PROBLEM. 35i very surprising fact that every one of the halolimnic gas-tropod genera should contain one or more forms which areindistinguishable from corresponding Jurassic types, or, inother words, that the gastropodean section of the halo-limnic fauna of Tanganyika should correspond en blocwith the gastropodean remains left by the Jurassic have, in fact, here something which
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