° 
THE BULLHEAD. ; 133 
with soft and scaleless skin, more or less studded 
with prickles or granulations; teeth in the 
jaws, on the vomer and palatine bones. 
Centridermichthys asper (Coltus asper, Rich. 
F. B. A. ‘ Fishes,’ p. 295), the Prickly-skinned 
Bullhead. — Sp. Ch.: Gill-openings separated 
beneath, by an isthmus; three opercular . spines ; 
crown with very small warts, back of the body 
with very minute spines; colour light yellow- 
ish brown, thickly dotted with spots nearly black. 
The length of the adult fish is seldom over 
three-and-a-half inches. 
- These tiny bullheads are common in all the 
streams east and west of the Cascades. They are 
not fond of going very far from the sea, but leave 
the larger rivers soon after entering them, seeking 
the clear rivulets and shallow lakes. In the 
streams flowing through the Sumass and Chiluk- 
weyuk prairies, in those flowing into Puget’s 
Sound, and north of it on the mainland to Fort 
Simpson, and in all the streams draining Vancou- 
ver Island, the prickly-skinned bullhead can be 
easily found in July and August. Similar in 
habits, and frequenting the same localities as the 
preceding, are several species described in the 
Appendix. 
Tue Rock Cop.—Belonging to the same family 
