4G. SALMONID^ COREGONUS. 301 



401> C. arJefln Le Sueur. — Lalce Herring ; Cisco; Michigan Herring. 



Body eloni^ate, compressed, not elevated. TIead compressed, rather 



pointed. Moiitli ratlier large, the maxillary reaching about to the 



middle of the pupil, about 3} in head ; the mandible 2.i- in head. Pre- 



orbital bone long and slender; suborbital broad; supraorbital nearly 



as long as eye, about 4 times as long as broad. Eye 4-5 in head. 



GiH-rakers very long and slender, as in Clnpea, as long as eye, 25-30 



below the angle. Bluish black or greenish above; sides silvery; scales 



with dark specks. Fins mostly pale, the lower dusky tinged. Head 



4i; depth -ih. D. 10; A. 12; scales 8-75 to 90-7. L. 12 inches. Great 



Lakes and northward to Alaska and Labrador; very abundant, usually 



frequenting shallow waters. In numerous small lakes in Indiana and 



AVisconsin (Geneva, Tii)pccanoe, Ocouomowoc, etc.) is the modified var. 



sisco [Argyrosomus sisco Jordan, Amer. Nat. 1875, 136), which lives in 



the deep v,aters, coming into shallower waters to spawn in December. 



{CoregonuH artecUTuQ Snanr, Journ. Acad. Nat. Sci. Phila. i,2:31, ISIS: Coregoniis clupei- 

 formis Giintliei', vi, 193, aud of nearly all authors, but uot Sahno clnpciformia of Miteli- 

 ill: Sahno (Coregonus) harengus Eicliardson, Fauna Bor.-Auicr. iii, 210: Sahno (Corego- 

 ■nus) luddus Richardson, Fauna Bor.-Amer. iii, 207: Coregonus Imidus Giiutlier, vi, l'J3: 

 Coregonus harengus Giinther, vi, 199.) 



495. C iJBgfB'apiBaBBBS (Gill) Jor. — Bhie-fm ; Blaclc-fui. 



Body stout, fusiform, compressed. Head stout. IMouth large, the 

 lower jaw projecting. Eye rather large, longer than snout, about 4 

 in head. Ttn'th very minute, but appreciable on premaxillaries and 

 tongue. Gill-rakers very numerous, long and slender. Color dark 

 bluish above; sides silvery, with dark punctulations; fins all blue- 

 black. Head 4^; depth 3% H. 10; A. 12; scales 9-88-7. L. IS 

 inches. Deep waters of Lake Michigan; locally abundant. Larger 

 than most of the other Coregoni. Known at once by the black fins. 



{Arggrosomus mgripinnis (Gill, MSS.) Milner, Rept. U. S. Fisli Com. 1872-7:), 87, 

 1875; Jordan, Man. Vert. 275.) 



§^ Body short, deep, compressed, shad-like; curve of the hack similar to that of iho 

 bcdly; scales large', notably larger forwards, rather closely iiubricated, the 

 postei'ior margin little convex. (AUosomus Jordan.*) 



496. C. tBllQibec Rich.— T»///7;fe; "Mongrel TFhile Fish". 



Body short, deep, compressed, shad-like, the dorsal and ventral 

 curves similar. Caudal peduncle short and deep. Head conic, com- 

 pressed, much as in C. nigrij)innis. Mouth large, the maxillary as long 



"Jordan, Man. Vert. od. 2, 1873, 331: type Coregonus tuUibce Rich. {aXXo?, other, 

 different; (j(b/.ta, body.) 



