^ 107 (ft). COTTID.E ICELUS. 691 



104§. I. Iiamatus Kriiyer. 



Yellowish, with many brown spots. Head large, naked; upper pre- 

 opercular spine small, hooked u^iwards, bifurcate; 3 spines below it, tv,o 

 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 ueck to base of caudal; a series of tubercles along 

 lateral Ime; 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-20; A. 16; V. I, 3. Algetic 

 Seas, Alaska to Spitzbergen. 



(Kroyer, Naturhist. Tidsskr. i, 1J53, 1844; Giiuther, ii, 172.) 



dd. Upper preopercular spine long, with 5 hooked processes. 

 1049. I. qMacli'iscB'flatMS (Lockingtou) J. & G. 



Pale olivaceous, somewhat mottled; lateral line with dark blotches; 

 branchiostegal region black in the males; a black bar at base of 

 caudal; a black spot at front of spinous dorsal, and one at tip of the 

 last spine; pectorals with a dark spot at base; other fins olivaceous, 

 little variegated. Body slender, little compressed, tapering from the 

 shoulders to the slender tail. Mouth 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 sim])]e 

 spines. Head naked or very nearly so, with conspicuous mucous pores 

 above and a few minute cirri. Dorsal tins separated; pectorals broad, 

 about reaching anal; ventrals very small. Lateral line with a series of 

 spinous jilates; above it along the ba(;k a double series of spinous 

 plates placed at an angle, the upper plates with the free edge down- 

 ward and backward, the lower plates with the free edge upward and 

 backward; this band composed of a single series before and behind, 

 and not extending around the dorsal in front; skin otherwise perfectly 

 smooth. Head 31; depth 5.4. D. VIII-13; A. 12; V. I, 3. L. 3 inches. 

 Deep waters ofif San Francisco; locally very abundant. 

 (Artediits qnadriseriatus Lockington, Proc. U. S. Nat. Mus. 1879, 330. ) 



aa. Spinous dorsal fin deeply cmarginate; head scaly. {Chiionotus'' Lockingtou.) 



* Lockington, Proc. U. S. Nat. Mus. 1881, 141 : type Chitonotua megacephalua Lock. 

 (xir<i>v, a rough cloak; v&>ro?, back.) 



