FOSSIL FISHES. 



Dentition of Dinichthys Tereelli, N. 



Side view, one-tenth natural Bize, linear. 



correspondence in dentition had been made exact by the existence in 

 Dinichthys of parts homologous to these, they would probably have been 

 easily separated from the cranium, as they are in Lepidosiren, and would 

 be quite sure not to be found in position. 



Dentition of Dinichthys Teeeelli. 



Front view (diagram) one-tenth natural size, linear. 



Professor Theodore Gill, the distinguished zoologist, who has examined 

 my specimens of Dinichthys^ while recognizing the great similarity' ex- 

 isting between the dentition of this genus and that of Lepidosiren, and 

 accepting my view of their close zoological relationship, is inclined to con- 

 sider the great anterior " teeth " of Dinichthys as homologous with the 

 small pair of nasal or vomerine teeth of Lepidosiren. The reason which 

 he gives for this opinion, is the separation in Dinichthys of the parts 

 which I have called premaxillaries and maxillaries, while in Lepidosiren^ 

 the dental apparatus of the upper jaw consists of a single, though folded: 



