Jordan and Evermann. — Fishes of North America. 4G1 



COREOONINyH : 



CI. Mouth not deeply cleft, tlio maxillary broad, the nmndible articulating with tho quadrate 

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

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

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

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

 supplemental bone. 

 0. Prema.xillaries broad, with the cutting edge nearly vertical or directed backward, 

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



COREOONUS, 231. 

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

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



AUOYROSOML'S, 1'il. 

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

 jaw prominent ; anal fin elongate ; scales modeiate. Stenodus, 233. 



Salmonin.i: : 



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



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



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



dd. Anal fin short, of 9 to 12 developed rays. 



('. 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 anadromous; 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. 



ff. 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) Liunibus. 

 (Whitefishes.) 



Coregonns, Artedi, Genera Piscium, 9, 1738. 



Cnregoiii, Linn.eus, Syst. Nat., Ed. x, 1758, 310, {Uifareliix). 



JViptervnoius, LacEpkde, Hist. Nat. Poiss., v, 48, 1803, (liauliii = lavaretm). 



('r)i-c</oHHx, LacEpkiie, Uist. Nat. Poiss., v, 203, 18(13, (lavurelns). 



Coref/onM.s, Cuvier, Regne Animal, Ed. i, 1G2, 1817, {tlii/Diallus, ^iiJ<we/M,«, etc.; restricted in Ed. 2, 



to hivaretus). 

 /Voso/jjiim, MiLNER, in Jorpan, Man. Vert., Ed. 2, 3G1, 1878, (qiiadrihiterdlif:). 



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 tin moderate ; caudal 

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

 Pseudobranchiii- large. (jJill rakers varying from short and thickish to long 



