218 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
rather small, 4^ in head. Scales rather small. Lateral line somewhat 
decurved. Twenty -four scales in front of dorsal. Fins moderate. Color 
light olive; a metallic vertebral band; sides and belly silvery ; no lateral 
band; a black spot at base of caudal; muzzle dusky; membrane of 
ui)per posterior part of dorsal fin black. Head 4; depth D. 8; A. 
8 ; scales 8-50-4 ; teeth 4-4. L. 4 inches. Tennessee River. 
(Cope, Journ. Acad. Nat. Sci. Pliila. 18C7, 227.) 
93.— COUESIUS Jordan. 
(Jordan, Bull. Hayden’s Geol. Surv. Terr, iv, 785, 1878: type Nocomis milneri Jordan = 
Leucosomus dissimilis Grd. ) 
Body elongate. Head normal, not depressed, the profile convex. 
Mouth terminal, normal, a well-developed barbel at the posterior end 
of the maxillary. Teeth 2, 4-4, hooked, without grinding surface. 
Scales rather small. Lateral line continuous. Dorsal fin over or 
slightly behind ventrals; anal basis short Size rather large. (Dedi- 
cated to Elliott Cones.) 
•Scales small, 60-70 in the course of the lateral line. 
t About thirty scales in a transverse series from dorsal to ventrals. 
341. C. squaiiigSeiitiis (Cope) Jor. 
Form stout, profile nearly plain. Muzzle not prominent. Mouth 
horizontal, the maxillary not reaching the orbit. Eye rather small, 4| 
in head, shorter than snout. Isthmus wide. Barbel quite small. Dor- 
sal fin slightly in advance of ventrals, behind middle of the body. 
Scales quite small. Olivaceous above; sides silvery; a lateral band of 
dark puuctulatious. Fins plain. Head 3| ; depths. D. 8; A. 7; scales 
17-06-14; teeth 2,4-4, 1. Henry’s Fork of Green River, Wyoming. 
(Cope.) 
(Ceratiohthys squamilentus Cope, Hayden’s Geol. Surv. Wyom. 1870, 442, 1872.) 
It About 20 scales in a transverse series from dorsal to ventrals. 
342. C. dBSSimiiis (Grd.) Jor. 
Form of Semotilus corporaUs, but more elongate aud less compressed. 
Head flattish above, the snout broad, projecting over the large, oblique 
mouth, maxillary reaching front of eye. Barbel very evident. Eye 
large, as long as snout, about 4 in head, l-J in iuterorbital space. Scales 
small, crowded forwards, those on the back smaller. Dorsal fin begin- 
ning over last ray of ventrals. Dusky above; sides somewhat silvery; 
.an obscure dusky band through eye around snout; fins plain. Head 4.}; 
