558 



The True Sharks 



ceous of England. Myliobatis dixoni is common in the Euro- 

 pean Eocene, as is also Myliobatis toliapicus and Aetobatis 



Fio. 349 Eagle-ray, Aetobalis narinari (Euphrasen). Cedar Keys, Fla. 



irregularis. Apocopodon seriacus is known from the Cretaceous 

 of Brazil. 



Family Psammodontidae. - - The Psammodontidce are known 

 only from the teeth, large, flat, or rounded and finely dotted or 

 roughened on the upper surface, as the name Psammodus 



