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II.—On the Mandible and Mandibular Teeth of Cochliodonts

Published online by Cambridge University Press:  01 May 2009

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The extinct cartilaginous fishes represented in ‘mountain lime-stone’ and similary aged carboniferous formations by detached teeth, or dental masses adapted for crushing, have been referred to the Cestraciont family; and, so far as I know, have now no nearer living representative, in the class of fishes, than the Port Jackson shark (Cestracion Philippi.)

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 32 , February 1867 , pp. 59 - 63
Copyright
Copyright © Cambridge University Press 1867

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References

1 Cochliodus magnus, Ag. 1835.Google Scholar

2 This structure of the teeth, recent and fossil, of Cestracionts and Cochliodonts, was microscopically determined and described in my Paper “On the Structure of Teeth,” Reports of British Association, 1838, p. 135. “These teath are composed of two substances, viz., an external almost colourless layer, with a finely punctate surface, which represents the enamel, and a coarser dentine composing the body of the tooth, and continuons with and passing into tis basis of support.”—Ib. and Odontography, p. 54Google Scholar. In the article ‘ Teeth ,’ Cyclopædia of Anatomy, vol. iv. 1852, these dental tissues are defined under the names ‘vasodentine,’ and ‘vitrodentine,’ p. 865.Google Scholar