Abstract
The deficiency of our knowledge of the organization and configuration of the Palaeozoic Selachii is an unfortunate fact too well known to biologists to render it necessary for me to dilate upon here. Immense numbers of genera and species have been founded upon detached teeth and spines; but as yet very few specimens have occurred, which threw any light upon the general organization and configuration of the ancient possessors of these now scattered relics.
Publisher
Cambridge University Press (CUP)
Reference10 articles.
1. In connexion with the dentition of Tristychius, see a paper by Mr. T. Stock in Ann. and Mag. Nat. Hist. Sept. 1883.