691 
107(«). COTTID.E ICELUS. 
1048. I. liamsitus Kioyer. 
Yellowish, with many brown spots. Head large, naked ; upper pre- 
opercular spine small, hooked upwards, bifurcate; 3 spines below it, two 
of them hooked upwards; two blunt occipital spines; vertex depressed. 
Skin of body above with warty scales and small prickles; some rows of 
bony scales from neck to base of caudal; a series of tubercles along 
lateral line; sides of body with scattered scales; interocular space 
very narrow, its width 4 in eye; dorsals separated; pectorals shorter 
than head; no air-bladder; gill-membranes broadly joined, free from 
isthmus; no slit behind last gill. D. IX-2h; A. 1C; V. I, 3. Arctic 
Seas, Alaska to Spitzbcrgen. 
(Kroyer, Natiirhist. Tidsskr. i, ‘.^53, 1844; Gunther, ii, 172.) 
dd. Upper preopercular spine long, with 5 hooked processes. 
1049. I. qtiadriseraatiis (Lockiugton) J. & G. 
Pale olivaceous, somewhat mottled; lateral line with dark blotches; 
brauchiostegal region black iu the males; a black bar at base of 
caudal; a black spot at front of spinous dorsal, and one at tip of the 
last s])ine; pectorals with a dark spot at base; other fins olivaceous, 
little variegated. Body slender, little compressed, tapering from the 
shoulders to the slender tail. Month moderate, the maxillaries reach- 
ing about to middle of pupil; a pair of ridges on the occiput, each 
ending in a spine, the space between them concave; interocular space 
very narrow, grooved; upper preopercular spine very long, armed with 
about 5 hooks, all but one directed upwards; below this three simi)]e 
spines. Head naked or very nearly so, with conspicuous mucous pores 
above and a few minute cirri. Dorsal fins separated; pectorals broad, 
about reaching anal; veutrals very small. Lateral line with a series of 
spinous plates; above it along the back a double series of spinous 
l)!ates placed at an angle, the upper plates with the free edge down- 
ward and backward, the lower jdates with the free edge upward and 
backward; this band composed of a single series before and behind, 
and not extending around the dorsal iu front; skin otherwise perfectly 
smooth. Head 3^; depth 54. D. YIII-13; A. 12; V. I, 3. L. 3 inches. 
Deep waters off San Francisco; locally very abundant. 
{Jrtedius qnadriseriatus Lockington, Proc. U. S. Nat. Mus. 1879, 330.) 
aa. Spinous dorsal fiu deeply emarginate ; liead scaly. (G/fitono/as^' Lockington.) 
* Lockington, Proc. U. S. Nat. Mns. 1881, 141: type Chitonotus megacephalus Lock. 
{xiT(hv, a rough cloak; v&toZ, back.) 
