THE FISHES OP BERING SEA. 489 



/ 

 from Aleutian Islands and Bristol Bay. Dr. Bean mentions it from Kadiak, Shuma- 



gins, Unalaska, and St. Michael. 



Dorsal, 77 to 84; anal, 60 and 61. Pectoral short and broad, less than half length 



of head. Interorbital ridge sharp, with a single series of scales. Gill rakers, 14 in 



lower limb of arch. 



218. Hippoglossoides robustus Gill and Townsend. 



Deep waters of Bering Sea; very close to the next. 



219. Hippoglossoides hamiltoni Jordan and Gilbert, new species. (Plate LXXXIV.) 



One specimen 17 cm. long, from station 3641, Avatcha Bay, Kamchatka; depth 

 16 fathoms. 



Nearly related to H. eldssodon, from which it differs in the fewer fin rays and 

 scales, the wider interorbital space, the longer caudal and pectoral fins, and the much 

 smaller symphysial knob. The nasal tubes are larger, the scales rougher, and ^;he 

 anterior part of lateral line more arched. Its relationship with Hippoglossoides robustus 

 of the same region is still closer. 



Head 3^ in length, depth 2f . Longest diameter of upper eye, 3^ in head ; snout 

 (measured from upper eye) 5 in head ; maxillary of colored side 2^, of blind side 2^ in 

 head. Depth of caudal peduncle equaling its length, 3J in head. D., 72; A., 56; P., 

 11. Pores in lateral line 91. 



Upper profile of head continuing the dorsal curve without interruption, there 

 being a slight depression a^ove the eye and an increased convexity on the snout. 

 The mandible is very heavy, and projects anteriorly so that its symphysial profile 

 completes the curve of the snout. A very short prominence at symphysis is directed 

 vertically downward. The gape is strongly curved and the mouth narrowed ante- 

 riorly so that the maxillary and premaxillary are almost wholly concealed along the 

 middle of their length by the overarching prefrontal. Teeth acute, in a single series 

 in each jaw, all except the anterior teeth in each jaw short. At the symphysis of 

 lower jaw the teeth are longer and directed inward, while in the anterior end of each 

 premaxillary the teeth are still more enlarged and the series on each side describes a 

 strong curve with its convex side toward the median line. The maxillary reaches 

 the vertical from slightly behind middle of lower eye. Nostril tubes conspicuous, the 

 anterior in closest proximity to the upper'lip, which it entirely overhangs. Posterior 

 nostril tube wider and slightly shorter. 



Byes of nearly equal size and opposite, separated by a wjider range than in 

 H. elassodon, the ridge bearing in its narrowest portion two well-defined rows of strongly 

 spinous scales. A conspicuous series of pores joining lateral line with upper margin 

 of upper eye, and another encircling the lower eye below and behind; a third series 

 along mandible and preopercle; one large pore above posterior nostril. Gill rakers 

 slender, unarmed, 2 above the angle, 11 or 12 below it, the longest 2f in eye. 



Dorsal fin beginning above front of pupil, the longest ray 2f in head. Anal pre- 

 ceded by a strong spine, its height equaling that of dorsal. Pectoral very long and 

 slender, two-thirds length of head; that of blind side shorter, half length of head. 



Ventrals reaching to base of fourth or fifth anal ray. Caudal long, evenly rounded 

 behind, the middle rays not longer than those adjacent, their length equaling distance 

 from tip of snout to preopercular margin. 



