46. salmonidj:: — cokegonus. 
301 
491. C. as’tealfl Le Sueur. — Lal-e Uerring ; Cisco; Michigan Ucrriiig. 
Body elongate, compressed, not elevated. Head compressed, rather 
pointed. Mouth rather large, the maxillary reaching about to the 
middle of the pupil, about 3.J in head; the mandible 2.^ in head. Pre- 
orbital bone long and slender; suborbital broad; supraorbital nearly 
as long as eye, about 4 tinies as long as broad. Eye 4-5 in head. 
Gill-rakers very long and slender, as in Clupea, as long as eye, 25-30 
below the angle. Bluish black or greenish abov'e; sides silvery ; scales 
with dark specks. Fins mostly pale, the lower dusky tinged. Head 
44; depth 44. 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 
■Wisconsin (Geneva, Tippecanoe, Oconoinowoc, etc.) is the modified var. 
sisco {Argyrosomus sisco Jordan, Ainer. Nat. 1875, 130), which lives in 
the deep waters, coming into shallower waters to spawn in December. 
(Coregonus artccWLe Sueur, Journ. Acad. Nat. Set. Pliila. i,231, 181S: Coregonus chipei- 
formis Giiutlier, vi, 193, and of nearly all authors, but not Sahno chipeiforinis of Mitch- 
ill: Salmo (Coregonus) harengus Eichardson, Fauna Bor.-Aincr. ill, 210: .Sahno (Corego- 
■iius) luculus Eichardson, Fauna Bor.-Amer. ill, 207: Coregonus lucidus Gunther, vi, 193: 
Coregonus harengus Giinther, vi, 199.) 
495. C. SBigS’ipiaiaais (Gill) Jor. — Blue-fin; Black-fin. 
Body stout, fusiform, compressed. Head stout. Mouth large, the 
lower jaw projecting. E 3 ’e rather large, longer than snout, about 4 
in head. Teeth very minute, but appreciable on premaxillaries and 
tongue. Gill-rakers very numerous, long and slender. Color dark 
blui.sh above; sides silvery, with dark punctulations; fins all blue- 
black. Head 41; depth 3^. D. 10; A. 12; scales 9-88-7. L. 18 
inches. Deep waters of Lake Michigan; locally abundant. Larger 
than most of the other Coregoni. Known at once by the black fins. 
(Arggrosomus vigripinnis (Gill, MSS.) Milner, Eei^t. U. S. Fish Com. 1872-’73, 87, 
1875; Jordan, Man. Vert. 275.) 
Body short, deep, compressed, shad-like; curve of the hack similar to that of the 
belly; scales large, notably larger foinvards, rather closely imbricated, the 
l>osterior margin little convex. (Allosomus Jordan.*) 
496. C. tie2Iil)ee Eich. — Tullihce; Mongrel White 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. mgrqrinnis. Mouth large, the maxillary as long 
* Jordan, Man. Vert. ed. 2, 1378, 331: type Coregonus tullibee Eich. (aXXo<, other, 
different; debjia, bod}'.) 
