262 FISHES. 



Var. spectrum, (Cope) Jordan. LAND-LOCKED SMELT. 

 Head 4 in length; eye large, 3 in head; depth 8^ in 

 length. Wilton Pond, Maine. 



Var. abbottii, (Cope) Jordan. ABBOTT'S SMELT. Head 

 ;4f in length; eye 4^ in head; depth 7 in length; colors 

 dark; lat. 1. 68. Cobessicontic L., Maine. 



3. THYMALLUS, Cuvier. GRAYLINGS. 



1. T. tricolor, Cope. MICHIGAN GRAYLING. Depth 

 4f in length ; head about the same ; purplish gray, silvery 

 below; dorsal with rosy markings and rows of green or 

 blue spots; D. 27; A. 13; lat. 1. 97. Waters of the 

 north part of the S. peninsula of Michigan; a beautiful 

 fish. 



4. ARGYROSOMUS, Agassiz. SISCOES. 

 * Body snb-fusiform ; depth 4 to 5 iii length. 



1. A. clupeiformis, (Mitch.) Ag. LAKE HERRING. 

 MICHIGAN HERRING. Head 4f in length (4^ to 5^); 

 depth 4 (3| to 4); eye 4 in head; maxillary 3J to 3f ; 

 mandible 2J; scales rather large and loose; bluish above, 

 silvery on sides and below; D. 12; A. 13; lat. 1. 7G; 

 length 12 to 18 inches. Great Lakes, etc., very abun- 

 dant; a shallow water species. (Coregonus albus, artedi^ 

 luciduS) harengus, etc. of authors.) 



2. A. sisco, Jordan. Sisco OF LAKE TIPPECANOE. 

 Head 4-J; depth 4^; eye 3| in head; maxillary 3; man- 

 dible 2-J; longest dorsal ray three times length of shortest; 

 steel blue above, sides silvery but without the clear lustre 

 of A. hoyi, finely punctate; D. 11; A. 13; lat. 1. 84. 

 Lakes of Indiana and Wisconsin, living in deep water 

 except at the spawning season; very close to the preced- 

 ing, of which it is probably a variety, but the habits are 

 more like those of the next. 



