FOSSIL FISHES. 

 Demthioh qf Diniohthys Tebselli, N. 



Side view, one-tentli nataral size, linear. 



correspondence in dentition had been made exact by the existence in 

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

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

 be quite sure not to be found in position. 



DmrnnoN of DINIOHTHITS TSEEEtLI. 



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



Professor Theodore Gill, the distinguished zoologist, who has examined 

 ray specimens of DmichtTuys, 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 Dmichihys as homologous with the 

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

 he gives for this opinion, is the separation in Dmichthys 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 



