Jordan and Evermann. Fishes of North America. 4G1 



OQREOONINJK : 



a. Mouth not deeply cleft, the maxillary broad, the mandible articulating with the quadrate 



bone under or before the eye. Dentition more or lees feeble or incomplete ; scales 



moderate or large ; anal fin rather long ; species imperfectly anadromous, or confined 



to rivers or lakes, their life lasting more than one year. 



b. Jaws toothless or nearly so ; scales large ; maxillary short and broad, with a broad 



supplemental bone. 



c. Premaxillaries broad, with the cutting edge nearly vertical or directed backward, 

 the lower jaw short and more or less included ; cleft of mouth short. 



COREGONUS, 231. 



cc. Premaxillaries with the cutting edge nearly horizontal and directed forward ; 

 lower jaw long, projecting beyond upper ; cleft of mouth rather long. 



ARGYROSOMUS, 232. 



l>b. Jaws, vomer, palatines, and tongue with bands of teeth ; maxillary very long ; lower 

 jaw prominent ; anal fin elongate ; scales moderate. STENODUS, 233. 



SALMONIN.K : 



aa. Mouth deeply cleft, the long lower jaw articulating with the quadrate bone behind the 

 eyes, the maxillaries rather narrow. Dentition strong and complete ; conical teeth 

 on jaws, vomer, and palatines ; tongue with two series of strong teeth (sometimes 

 deciduous in very old specimens); scales small. 



rf. Anal fin elongate, of 14 to 17 rays ; vomer narrow, long, flat, with weak teeth ; species 

 spotted with black, if at all. ONCORHYNCHUS, 234. 



<W. Anal fin short, of 9 to 12 developed rays. 



e. Vomer flat, its toothed surface plane ; teeth on the shaft of the vomer in alterna- 

 ting rows or in one zigzag row, those on the shaft placed directly on the surface 

 of the bone, not on a free crest; posterior vomerine teeth sometimes deciduous; 

 species black-spotted. SALMO, 235. 



ee. Vomer boat-shaped, the shaft strongly depressed, without teeth ; scales very small, 

 about 200 in the course of the lateral line ; species not auadromous; spotted 

 with red or gray. 



/. Vomer with a raised crest, extending backward from the head of the bone, 

 free from its shaft, this crest armed with strong teeth ; hyoid bone with a 

 broad band of strong teeth ; species spotted with gray, without bright 

 colors. CRISTIVOMER, 236. 



/. Vomer without raised crest, only the head being toothed ; hyoid bone with 

 very weak teeth or none ; species red-spotted, the lower fins with bright 

 edgings. SALVELINUS, 237. 



231. COREGONUS (Artedi) Linnaius. 

 (WHITEFISHES.) 



CoregomiK, ARTEIM, Genera Piscium, 9, 1738. 



Corei/tmi, LINN^US, Syst. Nat., Ed. x, 1758, 310, (lavaretus). 



Tripteranotus, LACPDE, Hist. Nat. Poiss., v, 48, 1803, (haulin = lavaretm). 



< 'on'<jnus, LACPEDE, Hist. Nat. Poiss., v, 2G3, 1803, (lavarc(ns). 



Coregonus, CUVIER, Regne Animal, Ed. I, 162, 1817, (lltyiiitillu*, lavaretus, etc.; restricted in Ed. 2, 



to lavaretus). 

 Prosop'mm, MILNER, in JORDAN, Man. Vert., Ed. 2, 361, 1878, (quadrilateral is). 



Body oblong or elongate, compressed. Head more or less conic, com- 

 pressed, the snout more or less projecting beyond the lower jaw. Mouth 

 small, the maxillary short, not extending beyond the orbit, with a well- 

 developed supplemental bone. Teeth extremely minute, if present. 

 Scales moderate, thin, cycloid, rather firm. Dorsal fin moderate ; caudal 

 fin deeply forked, anal fin somewhat elongate ; ventrals well developed. 

 Pseudobranchiai large. Gill rakers varying from short and thickish to long 



