FISHES OF THE EAST COAST OF NORTH AMERICA. 



791 



Class C— MARSIPOBRANCHII. 

 Order 11. — Hyperoartia. 



Sub-order. 



Super-family. 



Family. 



Sub-family. 



Genus. 







Petrorayzontidae. . (106) 



Petromyzontinae. 



Petromyzon (Linn.) Gray. 

 Ammocoetes (Bum.) QUI. 



Order 12.— Hyperotreta. 







Myxinidse (107) 





Myxine Linn 









Class D.— LEPTOOARDII. 

 Order 13. — Cirrostomi. 



Brancbiostomidae.(108) Branchiostoma Costa. 



