II.—On the Palæontology of the Selachian Genus Notidanus, Cuvier

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Abstract
Among the Selachians of the existing fauna, there are none of greater interest and higher morphological importance than Notidanus, Cestracion, and the recently-discovered Chlamydoselachus from Japanese seas. These are the solitary survivors of once flourishing types, whose immediate congeners are only known to Biological science through the fragmentary remains preserved in the geological record; and the value of the archaic features they present is even further enhanced by the slight information already acquired regarding the geological distribution of their numerous extinct allies.

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