1918 Bulletin 47, United States National Museum. 



very slender, its depth less than its length. Maxillary reaching to 

 or nearly to vertical from middle of orbit, 2| to 2f in length of head; 

 jaws weak; teeth villiform, with widened base, in moderate bands on 

 jaws, vomer, and palatines; nasal spines strong, projecting above a trans- 

 verse depression which crosses siiont immediately on front of orbits; 

 interorbital space narrow, its least width 3f times in orbit, its width 

 wholly occupied by the 2 conspicuous supraorbital mucous canals ; occi- 

 put a shallowly depressed pit, bounded anteriorly by the raised orbital 

 region, laterally by low rounded ridges each of which terminates behind in 

 a very strong spine; preopercular spines slender and sharp, the upper- 

 most directed very obliquely upward, sharply notched at tip ; the second 

 and third are directed downward and backward, the lowermost downward 

 and forward; bony stay across cheek conspicuously developed, and bear- 

 ing a distinct spine just behind eye; a series of mucous slits along under 

 side of suborbital stay; a sharp spine on subopercle; gill membranes 

 broadly united, free from isthmus; branchiostegals 6; a distinct slit-like 

 pore behind fourth gill ; eye large, 3 in head, longer than snout ; top and 

 sides of head with many minute scattered whitish pores; a minute fila- 

 ment near tips of maxillary ; plates of lateral line 43 to 46 in number, their 

 upper and posterior edges free, denticulated ; dorsal series with 45 plates, 

 each of which is crossed obliquely by a raised spiny ridge, the central por- 

 tion of which is highest ; between the upper angles of these plates a second 

 series of small plates alternating with the first, each bearing a spine or 

 prickle, these spines occasionally doubled or trebled, especially in the 

 anterior part of the series, and recall strikingly the arrangement in 

 Icelinus; axil of pectorals with 20 to 26 plates similar to those of lateral 

 line, and showing a tendency to a regular arrangement; 2 or 3 similar 

 plates along anterior part of base of anal, and a few scattered plates 

 on each side between lateral and dorsal series. Color light olivaceous 

 above, blackish below, except lower jaw; back with 4 black cross bars, 

 evident, but not conspicuous; opercles black; fins all dark; pectorals 

 mottled with slate color; base of caudal fin light; mouth and gill cavity 

 dark. Length 5 inches. Bering Sea, north of Unalaska, in deep water. 

 (Gilbert.) (canaliculatm, with small canals.) 



Icelus canaliculatus, GILBERT, Eept. U. S. Fish Comm. 1893 (1896), 412, pi. 24, off Unalaska, 

 at Albatross Station 3329, in 399 fathoms. 



2296. ICELUS ATJSTRALIS, Eigenmann & Eigenmann. 



Head 3 ; depth 7 ; eye 3 in head ; maxillary 2. Body rounded in trans- 

 verse section, scarcely compressed in the abdominal region, tapering from 

 the shoulders to the slender tail. Mouth large, the maxillaries reaching 

 beyond pupil. Occiput without ridges or spines ; interocular space slightly 

 grooved, very narrow, its width about the diameter of the pupil; profile 

 straight; upper preopercular spine rather short, simply dilated at the 

 extremity or with a single upward-directed spine near its tip; 3 simple 

 spines below it. Belly and an interrupted band along the sides white; 

 a series of blackish spots or interrupted band along the sides, Cortez 



