300 COXTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 



somus. Mouth rather large, termiual, the lower jaw evidently shorter 

 than upper, even when the mouth is open; tip of muzzle rather bluutly 

 truncate; maxillary reaching to opposite middle of pupil, about 3 in 

 head ; mandible extending to i)osterior margin of pupil. Supraorbital 

 and preorbital narrow. Eye very large, 3J in head. Tongue with 

 traces of teeth. Gill-rak^rs slender, about 25 below the angle, rather 

 long, nearly as long as eye. Pseudobranchias very large. Fins low; 

 free margin of dorsal very oblique. Color bluish above, sides and be- 

 low rich silvery, brighter than in any other of our Coregoni, much as in 

 Hijodo'n and Albula. Lateral line almost straight. Head 4J ; depth 4i^. 

 D. 10; A. 10; scales 7-75-7. L. 12 inches. Deep waters of Lake Mich- 

 igan, Lake Ontario, and neighboring- lakes; the smallest and hand- 

 somest of our Coregoni. It is intermediate in its relations between the 

 typical Coregoni and Argyrosomus. 



{Argp-osomus hotji (Gill, MSS.) Miliier, Rept. U. S. Fish Com. 1872-73, 86, 1874; 

 Jordau, Mau. Vert. ed. 2, 275.) 



** Lower jaw projecting; premaxillaries narrow, placed fnore or less horizontally. 

 § Body elongate, sub fusiform; scales small, uniform, convex behind. {Argyro- 

 somus Agassiz.*) 



493. C. Bnevlii Gthr. 



Steel-bliiish above, with many dark points ; belly white ; dorsal and 

 caudal mostlj' blackish ; x>ectorals and ventrals tipped with black ; eye 

 blackish, the iris silvery. Body rather elongate, compressed. Form 

 of mouth as in C. artedi, the lower jaw considerably projecting ; max- 

 illary broad, with rather broad 8upi)lemental bone, three times as long- 

 as wide, extending to middle of the very large eye, its length 3 in head; 

 preorbital extremely narrow. Length of mandible somewhat more than 

 least depth of tail. Teeth none, or reduced to minute asperities on 

 the tongue. Gill-rakers numerous, very long and slender. Dorsal 

 very high, much higher than long, its last rays rapidly shortened, the 

 first rays twice the length of base of fin; insertion of dorsal midway 

 between snout and middle of adipose fin. Caudal large, well forked; 

 anal small; ventral inserted under middle of dorsal, very long, ^ length 

 of head; pectoral the same length. Scales as in C. artedi. Head 5; 

 depth 59. Eye 3 in head. D. 11; A. 14; V.ll; scales 7-80-8. Behr- 

 iug's Sea to the north shore of Siberia, ascending rivers ; lately obtained 

 by Dr. Bean in Alaska. 



(Salmo clapeoides Pallas, Zoogr. Ross. Asiat. iii, 410; not Coregonus clnpcoidcs La- 

 c6pMe; Giinther, vi, 195.) 



* Agassiz, Lake Superior, 150, 339 : type Coregonus dupeiformis DeKay, not of 

 Mitchill, = C'o)rryoKMS arkdi Le Sueur, {apyvpoi, silver; 6(bi.ia, body.) 



