The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Two varieties of Amberleya, upper, compared with Bathanalia howesi, lower. Among the Jurassic fossil gastropods there aie a numberof forms which are typified by the so-called Littorina sulcata,and if the figures of the two specimens of this form givenon p. 349, lower, be compared with the back and front viewof the shell of Limnotrochus thomsoni from Tanganyikagiven on the same page, it will be realised how closely the THE TANGANYIKA PROBLEM. 349 living and the dead for
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . Two varieties of Amberleya, upper, compared with Bathanalia howesi, lower. Among the Jurassic fossil gastropods there aie a numberof forms which are typified by the so-called Littorina sulcata,and if the figures of the two specimens of this form givenon p. 349, lower, be compared with the back and front viewof the shell of Limnotrochus thomsoni from Tanganyikagiven on the same page, it will be realised how closely the THE TANGANYIKA PROBLEM. 349 living and the dead forms correspond. Not only do theabove halolimnic forms find their almost exact Jurassicparallels, it appears also that the remarkable shell of theTanganyika genus, Chytra, is repeated among the varietiesof the Jurassic genus Onustus (=Xenophera). Again wefind that the shells of the Tanganyika genus, Spekia.
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