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A genus of heavy shells in some respects resembling Astarte, in others especially in having a striated area within the beaks, Hippopodium, from which it is distinguished by the position of the umbones and the presence of a thick tooth in the hinge. Sowerby would not venture to say it belongs to that genus. Amongst these remains was also found embedded a very perfect specimen of fossil wood.
Hippopodium ponderosum, Sowerby. 1/4 diameter. Leptaena Moorei, Davidson. No less than eight or nine species of Spiriferina are enumerated by Mr. Davidson as belonging to the Lias. Palliobranchiate mollusca predominate greatly in strata older than the Trias; but, so far as we yet know, they did not survive the Liassic epoch. Ammonites Bucklandi, Sowerby. Ammonites bisulcatus, Brug.
This deposit contains numerous fossil shells, consisting chiefly of four distinct species of a new genus, nearest to hippopodium; also a new species of trochus; Atrypa glabra, and Spirifer, a shell occurring also in older limestones of England.* These shells having been submitted to Mr. James De Carl Sowerby, I am indebted to that gentleman for the following description: Class Conchifera.
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