FOSSIL GANOIDS 



157 



Eurynotus (Fig. 159) had attained a great depth of body 

 and prominent dorsal fin ; CJieirodiis (Fig. 160) was dis- 

 tinctly flattened; Semionotus (Fig. 161) was small, with 



Fig. 160. — Cheirodus granulosus. Young, x 

 (After Traquair.) 



Coal Measures. Scotland. 



elaborate fin conditions; AspidorhyncJuts (Fig. 162) had a 

 remarkable pointed snout and a reduced number of body 



Fig. 161. — Semionotus kapffi, Fraas. X 

 Keuper, Stuttgart, 



(From ZiTTEL, after FRAAS.) 



plates ; Microdon (Fig. 163), flattened like Cheirodus, had 



evolved an admirable series of crushing teeth (-Pychodont). 



And, finally, is to be mentioned Palceoniscus (Fig. 164), 



a form whose abundance, numerous species, and long sur- 



