FISHES OF THE EAST COAST OF NORTH AMERICA. 791 



Class C— MARSIPOBR ARCHIL 

 Order 11. — Hyperoartia. 



Sub-order. 



Super-family. 



Family. 



Sub-family. 



Geuus. 







Petromyzontidae. . (106) 



Petromyzontinas. 



Petromyzon (Linn.) Gray. 

 AmmocGBtes (Dum.) Gill. 



Order 12. — Hyperotreta. 







Myxinidce (107) 





Myxine Linn. 







Class D.— LEPTOOARDIL 



Order 13. — Cirrostomi. 



Branchiostomidos . (108) Branchiostonia Costa. 



