46. SALMONID^— THALEICHTHYS. 
291 
140.— MALLOTUS Cnvier. 
Capelins. 
(Cavicr, Et'gne Aniin. 1829, ed. 2, ii: type Chipea riUosa Miiller.) 
Body elongate, compressed, covered with mimite scales, a band of 
which, above the lateral line and along each side of the belly, are en- 
larged, and ill mature males they become elongate-lanceolate, densely 
imbricated, with free, jirojecting jioiiits, forming villous bands. In very 
old males the scales of the back and belly are similarly modified, and 
the top of the head and the 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 pterygoids; 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). Pseudobranchim quite small. Gill-rakers long, slen- 
der. Pyloric coeca 6, small. Ova very small. Marine species of the 
2sorth Atlantic and Pacific. villous.) 
476. M. vb53oS81S (Muller) Cuvier. — Capelin. 
Dusky olivaceous above, grayish silvery on sides and below. Dead 
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, in head. Head 4^ in length; depth about 6. D. 12; A. 18. 
Lat. 1. ca. 150. Greenland to Cape Cod and Alaska; abundant north- 
ward. 
{Chipea viUosa Muller, Protlr. Zoiil. Dan. 1777, 245; Giinther, vi, 170.) 
141.— THALEICIITHYS Girard. 
Eulaclion. 
(Girard, U. S. Pac. R. R. Surv. Fi.sli. 1859, 325: tyi>e Thaleiclitlujs stcvensi Grd. — Salmo 
pacificus Rich.) 
This genus is intermediate between MaUotus and Osmerus, 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. Ko permanent teeth on the tongue. The scales 
are much smaller than in Osmerus, and more closely adherent; larger 
than in Mallotus, and similar in the two sexes. The coloration is dusky. 
