402 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



longed rajs or conspicuous color marking. The dorsal fin has a median black blotcli 

 and the caudal is slightly dusky on posterior half. 



23. Salveliniis malma (Walbaum). Dolly Varden Trout. 



The Dolly ^'arden trout was found to be very abundant in the neighborhood of 

 Unalaska, sea-run individuals congregating in great numbers at the mouths and in the 

 lower course of streams when the salmon were running in to spawn. A small stream 

 entering Cai>tain's Harbor, Unalaska Island, has a series of impassable cascades 

 aggregating several hundred feet in lieight. Above these falls tlie trout are very 

 abundant, but are dwarfed in size and remarkably brilliant in coloration. They 

 seem to reach no larger size than 8 inches. The largest individual seen during 

 the season was captured in Makushin Bay, Unalaska Island, August 17. It Wiis 24 

 inches long, witli a depth of 6 inclies, and weighed G pounds. The species was also 

 seined in salt water in Chernoffski Harbor, Unalaska Island. 



The black-spotted trout {Salmo mykiss), reported by Dr. Bean, from Unalaska, was 

 not seen by us. Its occurrence there must be exceptional. 



Family MICROSTOMIDiE. 



24. Bathylagus borealis sp. nov. 



A single specimen, 132 nmi. long to base of caudal, from station 3.S27 (north of 

 Unalaska Island, depth 322 fathoms), is taken for the type. A second specimen from 

 the same region, station 3325, dejith 284 fathoms. 



Head 4,^^ to base of caudal, depth 5?, eye 2^ in head, snout 2f in eye. Interorbital 

 width grooved, the groove widening posteriorly, opening onto the flat occipital 

 region, which is not swollen. Width of cartilaginous portion of interorbital space 

 one-third orbit; including the thin membranous plates which overarch the orbits, 

 the interorbital width is three-fourths orbit. The anterior profile of snout declines 

 gently, bringing tlie mesial portion of premaxillaries on a level with lower nvargin 

 of pupil. Distance from tip of snout to end of maxillary slightly exceeding 

 length of snout, 2i in orbit. Opercle with two strong ridges diverging downwards 

 and backwards from behind the eye. 



Front of dorsal midway between front of snout and adipose fin. Base of dorsal 

 contained 3i^ times in length of head. Ventrals inserted under posterior portion of 

 dorsal. Free jiortion of adipose fin very long and narrow, rising aljove the base of 

 the second and third anal rays before the last, its tip reaching rudimentary caudal 

 rays when depressed. Anal fin rather long, the base 1;^ in head, the vent immediately 

 before it. Length of tail much exceeding head, 3f in total length without caudal. 

 Dorsal 8; anal 19; ventral 8; pectoral 8. Scales in about 40 rows, judging from the 

 scars. Head scaleless. 



Uniform blackish-brown on sides, the head and ventral region bine-black. 



Difiering from B. pacificus in its much greater depth, longer tail, longer anal fin, 

 and flat occiput. 



Family CHAULIODONTIDiE. The Viper Fishes. 



25. Chauliodus macouni Bean. 



Two specimens were secured, one at station 3340, south of the Alaskan Peninsula, 

 at a depth of 695 fathoms; another at station 3347, oft" the northern coast of Oregon, 

 at a depth of .345 fathoms. It is not evident in what respects the Pacific form differs 

 from C. sloani of the Atlantic, but as no specimens of the latter are at hand for 

 comparison we follow Dr. Bean in holding them distinct. 



26. Cyclothone microdon (Giinther). 



Taken in Bering Sea, southwest of the Pribilof islands, at stations 3307 and 3308; 

 depths 1,033 and 1,625 fathoms. 



