12. Jaws elongated, shaped like a duck's billj large irregular teeth 



Chain Pickerel 

 Esocidae 



p. 39 



Jaws not elongated J teeth weakj tail more or less rounded 



Killifish 

 Cyprinodontidae 

 p. 41 



13. Mouth points downward (inferior), is sucker-like with thick, papil- 



lose lips J dorsal fin with 10 or more rays. 



^^^^.,^r"<\^^^ Suckers 



^^0J^^ ■■ -■-■■■) (^ Catostomidae 



Mouth opening toward the front (terminal or subterminal) j dorsal fin 

 with less than 10 rays 



— ril_^_^ Minnows 



^Ej)^^^^ ^^ ^ ^ ^ I^ Cyprinidae 



14. Body scaleless, but may be covered with spines or prickles; head 



large J eyes in top of headj pectoral fins large 



Body with scales 15 



15. Single median barbel on chin 



^ — ^^^''^^^^^^^^^ir^-, Burbot 



^^)^0 _^^r—-^^^^-^ Gadidae 



^^5^ p. 41 



No barbel on chin 16 



9 



