710 CONTRIBUTIONS TO NOETH AMERICAN ICHTHYOLOGY IV. 



braries not broadly uuited, nearly free from isthmus. Dorsal fins well 

 separated; spinous dorsal sliort and low, its height little more than 

 length of snout; second dorsal A'ery large, 3 times height of first, its 

 longest rays about as long as head; anal high, half as high as second 

 dorsal; pectoral long, reaching past front of anal; ventrals well devel- 

 oped; lateral line chain-like, conspicuous; skin perfectly smooth. Head 

 3; depth 6. D. YII-IS; A. 15; V. I, 3. L. 3 inches. Deep waters of 

 the Great Lakes. 



(Girai'd, Proc. Bost. Soc. Nat. Hist, iv, 19, 1851; Girard, Monogr. Cott. 65: Ptyonotus 

 thompsoni Guuther, ii, 175, the uaiue Triglopsis being set aside- ou account of the i^rior 

 TrigIo2)s.) 



3T0.— EIVOPHKYS Swainson. 

 (Asjncottus Gvd. : Cly2}eocottus Ayves: Ccratocottus GUI.) 

 (Swair.son, Class. Fish. &c. 1839, 271: type Cottus claviger C. & V.) 



Body short and thick, depressed anteriorly. Head very large, mailed 

 above with rugose, bony plates ; a series of large, rough, bony plates 

 along lateral line; no scales. Teeth in villiform bands in jaws and on 

 vomer, none on i^alatines; preopercle with strong, straight si^ines; sub- 

 orbital stay broad, externally bony; gill-membranes joined to the isth- 

 mus, not forming a fold across it; a slit behind fourth gill. Dorsal fins 

 separate, the anterior short, not notched; anal short. Intestinal canal 

 elongate. Herbivorous, feeding chiefly on algse. (sv, on ; o^puq^ eye- 

 brow.) 



1©©!. E. bison (Grd.) J. & G.— Stone ScuJpin. 



Olivaceous above, variegated with blackish and reddish, yellowish 

 below ; fins olivaceous, marked Mith black ; ventrals pale. Snout blunt; 

 maxillary reaching beyond pupil; external bones of head rough-granu- 

 lar; iuterorbital space elevated and concave, the orbital ridge without 

 spine; suborbital stay covering most of cheek; a ridge extending back- 

 wards from each eye, the two connected by a cross ridge at occiput; the 

 ridges are large and rough, and the space between them is concave; 

 preopercle with 4 spines, the upper very long, straight and rough, 

 usually reaching past opercle, a little more than one-third head; oper- 

 cular ridge very broad; subopercle with 2 diverging spines; a single 

 series of large, rough, granular plates along sides, from opercle to base 

 of caudal, the plates without keel or spine and growing smaller behind; 

 spinous dorsal small, much lower than soft rays; anal short. Head 2^; 

 depth 4. D. ¥111-12; A. 9. L. 12 inches. San Francisco to Alaska; 



