SYNOPSIS OF THE ARRANGEMENT OF FISHES. 185 



Catastomus. Lips fleshy, very thick, plaited, crenated, or 

 tuberculated. 



Labia. Upper lip thick, crenated, or tuberculated ; lower thin ; caudal 



acutely forked. 

 Catastomus. Both lips thick, plaited, the lower one dependent. 

 Chedrus. Lips tuberculated, equal ; dorsal fin near the caudal. 



Leuciscus. Dorsal between the ventral and anal fins, the 

 anterior dorsal rays not spined. 



Chela. Mouth small, vertical ; dorsal near the caudal ; ventrals long. 



JEsomus. Anal beneath the dorsal ; cirri very long. 



Leuciscus. Dorsal between the ventral and anal ; no cirri. 



Tinea. Dorsal beneath the ventral ; lips rather fleshy ; cirri small, or 



wanting. 

 Abrajnis. Anal fin lengthened. 

 Gonorhynchus. Mouth beneath the snout ; head and body scaly. 



* * With strong teeth. 

 Erythrinus. Mouth large ; head depressed, bony, naked. 



* * * Dorsal fin single, very long. 



Sums. Head depressed, naked, corrugated ; teeth large. 



Clupisudis. Head and mouth smaller ; teeth minute ; gills nearly 

 smooth. 



2. Sub-family Salmonin^. Salmon. — Dorsal fins two f , 

 the hinder adipose. 



* Teeth on the tongue ; gill membrane seven-rayed. 



Salmo. Mouth cleft horizontally as far as, or behind the eye ; 



teeth sharp. 



Mallotus. Body linear, of nearly equal breadth ; pectorals rounded. 



Coregonus. Mouth small ; teeth minute, or none. 



Argentina. Body semi-transparent ; jaw teeth none ; snout depressed. 



* * Mouth very large ; muzzle obtuse. 



Laurida. Teeth acute, unequal, moveable ; ventral fins 



large. 



Trim-US. Caudal terminating in three points. 



Harpadon. Teeth crooked and barbed ; ventral fin under the pectoral. 

 Aulopus. Teeth small, equal; ventral fin beneath the first dorsal. 

 Cynodon. Mouth oblique; teeth large ; unequal ventrals. 



* ** Tongue smooth; gill membrane four to five rayed. 



Characinus. Mouth small, cleft obliquely, and sinuated; 



belly smooth. 



Anodus. Resembling Characinus, but without teeth. 

 Curimatus. Mouth very small, not sinuated ; teeth small, 

 Serrasalmo. Body short ; first dorsal behind the ventral ; belly ser- 

 rated. 



t Except in Sternoptyx. 



