8. Scales large, fewer than 75 along lateral line 



IfL \ /^ American Smelt 



-^ N^ '^~-^'''%/ Osmerklae 



-#T ^^^ ^^ Xj P- 55 



Scales small, more than 105 along lateral line 



/%4?:^ ^ Salmon and Trout 



^ x«, -^1 Sabnonidae 



^^ — -^ ' p. 21 



9. Midline of belly provided with saw-Uke keel 



Alewife 

 \[^) \ W'/' Cliipeiclae 



^ -^ ^, P-19 



Midline of belly without a saw-like keel 10 



10. Head scaly or partially scaly 11 



Head without scales 12 



11. Jaws elongated, shaped like a duck's bill; large irregular teeth; 



caudal fin forked 



.^^ .^ Chain Pickerel 



j) ^V tsociaae 



% \l^ ^^P^''^ p. 68 



Jaws not elongated; teeth weak; caudal fin more or less rounded 



Killifish 

 v-^ ) J-^^r-^\ ^^^^ \ Cyprinodontidae 



p. 70 

 13 



