46. SALMONID^— THALEICHTHYS. 291 



140.— ITIALLOTUS Cuvier. 



(Cuvior, Ri'giu^ Auiin. 1829, ed. 2, ii: type Clupea villosa Miiller.) 



Body elongate, eompressed, covered with minute scales, a band of 

 whicli, above the lateral line and along- each side of the bell3^, are en- 

 larged, and in mature males they become elongate-lanceolate, densely 

 imbricated, with free, projecting points, forming villous bands. In very 

 old males the scales of the back and belly are similarly modified, and 

 the top of the head and tlie rays of the paired fins are finely granu- 

 lated. Mouth rather large, the maxillary thin, extending to below the 

 middle of the large eye. Teeth minute, forming single series on the 

 jaws, vomer, palatines, and iiterygoids; lingual teeth somewhat en- 

 larged, in an elliptical patch. Lower jaw projecting. Dorsal inserted 

 over ventrals. Branchiostegals 8-10. Lower fins very large. Pec- 

 toral fins large, horizontal, with very broad base, their rays in increased 

 number (16-20). PseudobranchiiB quite small. Gill-rakers long, slen- 

 der. Pyloric coeca 6, small. Ova very small. Marine species of the 

 North Atlantic and Pacific. [/ml/.ujTd-, villous.) 



476. M. vaSaossiS (Miiller) Cuvier. — Capelin. 



Dusky olivaceous above, grayish silvery on sides and below. Head 

 long, pointed. Base of anal in males compressed and prominent; pec- 

 torals reaching more than half way to ventrals, the latter to anal. Eye 

 large, 3 J in head. Head 4^ in length; depth about 6. D. 12; A. IS. 

 Lat. 1. ca. 150. Greenland to Cape Cod and Alaska; abundant north- 

 ward. 



(^Clupca villosa Miiller, Prodr. Zool. Dan. 1777, 245; Giintlier, vi, 170.) 



111.— THAILEIC'IITHYS Girard. 



I^ulacJion. 



(Girard, U. S. Pac. R. R. Surv. Fisli. 1859, 325: type Thaleichthys stcvensi Grd.^Salmo 

 pacificus Ricb.) 



This genus is intermediate between Mallotus and Osmcrns, differing 

 from the latter in its rudimentary dentition. All the teeth are very 

 feeble, slender, and deciduous, although occasionally present on all the 

 bones of the mouth. No permanent teeth on the tongue. The scales 

 are much smaller th.'in in Osmerus, and more closely adherent; larger 

 than in Mallotus, and similar in the two sexes. The coloration is dusky. 



