The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . te,more rarely trochoid, rather thin, imperforate or nearly so ;sub-elongate, frequently turreted ; sutural space wide ;ornamented with spiral bands, usually spinulous or nodular,some of which are prominent. The interspaces are finelystriated, the striae being slightly oblique to the these fine lines are strong enough to representfine axial ribs. Base rounded, spirally ribbed and markedby fine radial striae ; aperture sub-oval, but varyingaccording to ag
The Tanganyika problem; an account of the researches undertaken concerning the existence of marine animals in Central Africa . te,more rarely trochoid, rather thin, imperforate or nearly so ;sub-elongate, frequently turreted ; sutural space wide ;ornamented with spiral bands, usually spinulous or nodular,some of which are prominent. The interspaces are finelystriated, the striae being slightly oblique to the these fine lines are strong enough to representfine axial ribs. Base rounded, spirally ribbed and markedby fine radial striae ; aperture sub-oval, but varyingaccording to age, in the adult more or less rounded, so asto become sub-oval or sub-circular ; there is usually a con-siderable deposit of callus ; outer lip thin, often crenulate. THE TANGANYIKA PROBLEM. 347 This description would certainly absolutely answer forthat of one of the new types which I found in Tanganyika,and to which I gave the generic name of Bathanalia(p. 348, lower). Although the Jurassic genus Ambevleyashows a considerable range of specific variation, all itsspecies have essentially the same characteristics as the two.
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