772 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
front, and one from the occiput toward tbe base of tbe dorsal fin. 
Each of these has on each side, series of short branches, placed at 
right angles to the main line, those on opposite sides alternating. 
Each of these branches has about two open mucous pores. Head 
short, bluntish, scaleless; mouth moderate, oblique; jaws with rather 
strong teeth, the anterior canine-like; no teeth on vomer or palatines. 
Branchiostegals C; gill-membranes separate, free from the isthmus. A 
single long, low, uniform dorsal fin, consisting of spines only; anal fin 
similar in form, with 2 small spines; caudal short, joined to dorsal and 
anal; no ventral fins; pectoral fins very small. Intestinal canal mod- 
erately elongate, with 4-G well -developed pyloric coeca. Herbivorous, 
feeding on algce. Active fishes, inhabiting tide-pools and crevices 
among rocks in the. North Pacific. a sword-belt.) 
Ill'S. X. cliirns Jordan &, Gilbert. 
Color olive-brown, yellowish below; sides with marblings of different 
shades of brown, sometimes with short blackish vertical bars; some 
round black spots along the back and sides; a black spot behind 
oi^ercles; numerous black spots on sides of head, forming in older spec- 
imens light and dark streaks, which radiate from eye across cheeks 
and opercles, the pale streaks forming reticulations; dorsal with black 
spots, and a series of bright reddish-brown cross-blotches; pectorals 
and caudal idain. Head short; nape not constricted; mouth small; 
maxillary extending to middle of pupil; teeth strong, the anterior 
canine-like, bluntish; about 4 canines in lower jaw, 5 or 6 in the upper, 
similar to the teeth behind them, but somewhat larger. Abdominal 
lines meeting on the breast, but not connected with the lower lateral 
line. Dorsal fin beginning close behind pectoral; nape midway be- 
tween middle of eye and front of dorsal; anal beginning about a head’s 
length nearer snout than base of caudal; pectoral fin comparatively 
large, longer than the eye, its length about equal to distance between 
middle and lower lateral lines. Head 7; depth 9. D. LXX; A. II, 50. 
Monterey to Alaska; smaller than the other species, and living in 
deeper water. 
(Jordan &. Gilbert, Proc. U. S. Nat. Mus. 1880, 135.) 
111®. X. mticosiis (Girard) Jordan. 
Blackish green, pale on belly and sides of head, marked posteriorly 
with olive-green in various pattern; a transverse light-greenish bar at 
base of caudal; 3 olive-brown streaks, radiating backward from eye, 
paler in the center and edged above and below with blackish, outside 
