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IJiagnosis. Shell oblong, oval, somewhat pentagonal: ventral valve convex, and in general deeper than the dorsal one, which is more or less prominently ~iplicated ; beak short, rounded, incurved, and obliquely truncated by a circular foramen of moderate dimensions: Deltidium very narrow, and generally inconspicuous from the aperture being contiguous to the umbo of the dorsal valve: lateral margins flexuous, bisinuated in front; surface smooth, marked by concentric lines of growth, and at times obscurely striated on the sides ; loop simple, not exceeding one third of the length of the socket valve. Dimensions variable; length 23, width 16, depth 11 lines. Obs. It was not until after much consideration and repeated comparisons of more than three thousand examples, that I could make up my mind to refer to a single species the biplicated terebratulce illustrated in Plate VI. of the present monograph. The term Anomia biplicata was first introduced by Brocchi for a cretaceous terebratula from San Quirico, in rruscany; no description was appended, but the figure then published represents a smooth, oblong oval, or somewhat pentagonal shell, 14 lines in length, b!J 9 in breadth, notched or

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Author

Thomas Davidson

Publisher

Informa UK Limited

Published

1855

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)