1918 Bulletin //, 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 Villiforni, with widened b.ase, in moderate Lands on 

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

 verse depression which crosses snout immediately on front of orbits; 

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

 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 l)y 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; operoles 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 Uualaska, in deep water. 

 (Gilbert.) {eanaliculaius, with small canals.) 



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

 at Albatross Station 3329, in 399 fathoms. 



2206. ICELUS AUSTRALIS, 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 wddth al>out I 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 



