FOSSIL GANOIDS 157 
Eurynotus (Fig. 159) had attained a great depth of body 
and prominent dorsal fin; Chetvodus (Fig. 160) was dis- 
tinctly flattened; Semionotus (Fig. 161) was small, with 
Fig. 160.— Cheirodus granulosus, Young. X 4. Coal Measures, Scotland. 
(After TRAQUAIR.) : 
elaborate fin conditions; Aspidorhynchus (Fig. 162) had a 
remarkable pointed snout and a reduced number of body 
SS ot 
xX <2 oJ 28. {/ 
CE "a 
o AL 
MELT, 
Fig. 161.— Semionotus kapfi, Fraas. X 4%. (From ZITTEL, after FRAAS.) 
Keuper, Stuttgart. 
plates ; Microdon (Fig. 163), flattened like Cheirodus, had 
evolved an admirable series of crushing teeth (-Pycnodont). 
And, finally, is to be mentioned Pa/goniscus (Fig. 164), 
a form whose abundance, numerous species, and long sur- 
