Synopses & Reviews
Synopsis
Excerpt from Contributions to British Pal ontology: Or First Descriptions of Three Hundred and Sixty Species and Several Genera of Fossil Radiata, Articulata, Mollusca, and Pisces From the Tertiary, Creatogous, Oolitic, and Pal zoic Strata of Great Britain
Gen. Char. Tooth simply conical, gradually tapering, Slightly curved backwards, apex pointed, section circular throughout; medullary cavity large, conical, simple, so wide at base that the tooth is reduced to a thin edge; surface even, very finely striated longitudinally. Microsc0pic structure - exceedingly fine calci gerous tubes radiating directly from the pulp-cavity towards the periphery, near which they terminate in numerous very minute calcigerous cells, beyond which is a narrow clear layer bounded by a definite dark line, outside of which is a coating of glass like enamel, without perceptible organic structure under a power of 300 diameters.
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