The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . IAmnotrochus thomsoni, upper, compared with Littorina sulcata, lower. (p. 351), are practically indistinguishable from the fossil re-mains of the shells of the marine Jurassic genus Neridomusrepresented on the same page. Nor does the comparisonend here. There is among the gastropods of the halolimnicgroup a very remarkable and characteristic shell whichSmith named Melania admirabilis. It is a Cerithoid formtotally unlike any other living type which is known, but 35° TH
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . IAmnotrochus thomsoni, upper, compared with Littorina sulcata, lower. (p. 351), are practically indistinguishable from the fossil re-mains of the shells of the marine Jurassic genus Neridomusrepresented on the same page. Nor does the comparisonend here. There is among the gastropods of the halolimnicgroup a very remarkable and characteristic shell whichSmith named Melania admirabilis. It is a Cerithoid formtotally unlike any other living type which is known, but 35° THE TANGANYIKA PROBLEM. it has been found by comparison that it is practically-indistinguishable from the inferior Oolitic fossil knownas Cerithium sub scalar if or me. The above examples ofthe existence of a minute similarity between the shells ofthe halolimnic group and those of the Oolitic seas aresufficiently striking, but it should still further be pointedout that even the genus Typkobia, of Tanganyika, is matched.
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