2 aiLMONID^. 



Synopsis of the Genera. 

 A. Dorsal Jin opposite or nearly opposite to ventrals: Saimontna. 



Scales small ; dentition strong and complete ; maxillary long * ; caec. pyl. nume- 

 rous; anal rays 14 or less 1. Salmo, p. 2. 



Scales small ; dentition strong and complete ; maxillary long ; caec. pyl. nume- 

 rous; anal ray* more than 14 2. Oncorhtnchus, p. 155. 



Scales small ; teeth rather feeble : maxillary short and broad ; anal short. 



3. Brachymystax, p. 162. 



Scales of moderate size; dentition yery feeble, incomplete; maxillary long; 

 caec. pyl. numerous 4. Luciotectta, p. 164. 



Teeth feeble, a part compressed, laminated 5. Plecoglossus, p. 165. 



Scales of moderate size ; dentition complete, fang^Iike teeth on the Tomer and 

 tongue ; maxillary long ; caec. pyl. in small numter. 



6. OSMERtJS, p. 166. 



Scales small ; dentition incomplete, very feeble ; maxillary long ; caec. pyl. in 

 moderate number 7. Thaleichthys, p. 168. 



Scales small ; dentition incomplete, very feeble ; maxillary thin and short. 



8. Hypomesus, p. 169. 



Scales very small ; dentition complete, feeble ; maxillary extending to below the 

 middle of the orbit ; caec. pyl. in small niunber. 9. Mallotus, p. 170. 



Scales of moderate size ; dentition complete, feeble ; cleft of the mouth of mode- 

 rate width ; dorsal behind ventrals ; caec. pyl. none. 



10. Eeteopinna, p. 171. 



Scales of moderate size ; teeth minute, if present ; maxillary short and broad ; 

 dorsal short; caec. pyl. numerous 11. Cokegonus, p. 172. 



Dorsal fin long, many-rayed 12. Thtmallus, p. 200. 



Scales rather large ; jaws toothless, palate with small teeth ; maxillary very short, 

 not extending to orbit ; dorsal short ; caec, pyl. in moderate number. 



13. Argentina, p. 202. 



Scales large, very thin ; very small teeth in lower jaw and on vomer, no other 

 teeth. Cleit of mouth very small. Adipose fin rudimental. Caec. pyl. none. 



14. Microstoma, p. 204. 



B. Dorsal Jin placed far behind the ventrals : SalaiwuNa. 

 Body naked (?) 15. Salanx, p. 205. 



First Group. SALMONINA. 



1. SALMO. 



Salmo, Artedi, Genera, p. 11. 

 Salmo, Fario et Salar, Ctiv. 8f Val. 



Body covered with small scales. Cleft of the mouth mde, the 

 maxillary extending to below or beyond the eye. Dentition well 

 developed ; conical teeth in the jaw-bones, on the vomer and pala- 

 tines, and on the tongue, none on the pterygoid bones. Anal short, 

 with less than fourteen rays. Pyloric appendages numerous ; ova 

 large. 



* In the adult, fish. 



