PLATE II 
Fig. 7. Lower jaw of young Whitefish (Core- 
gonus clupeiformis), showing rapta- 
Fig. 5. Upper jaw of young Gizzard-shad 
torial teeth. 30 
(Dorosoma cepedianunt), showing minute 
teeth. 30 
Paddle-fish (Poloydon spathula). X'/14 
Fig. 6. 
KV re. 
Fig. 9. Lake Sturgeon (Acipenser rubicundus). 
