Jordan and Evcrmann. Fishes of North America. 2825 



between front of snout and adipose fin ; base of dorsal contained %\ times 

 in length of head. Ventrals inserted under posterior portion of dorsal. 

 Free portion of adipose fin very long and narrow, rising above the base of 

 the second and third anal rays before the last, its tip reaching rudimen- 

 tary caudal rays when depressed; anal fin rather long, the base \~ in 

 head, the vent immediately before it. Length of tail much exceed ing- 

 head, 3* in total length without caudal. Uniform blackish brown on sides, 

 the head and ventral region blue black. Differing from B. pacificus in its 

 much greater depth, longer tail, longer anal fin, and flat occiput. Length 

 132 mm. Bering Sea, in deep water north of Unalaska ; 2 specimens known. 

 (borealis, northern.) 



Bathylagus borealis, GILBERT, Kept. U. S. Fish Comm. 1893 (Dec. 9, 1896), 402, Bering Sea 

 at Albatross Station 3327, north of Unalaska, in 322 fathoms. 



804(b). BATHYLAGUS MILLEBI, Jordan & Gilbert, new species. 



Distinguished by the posterior insertion of the dorsal fin and the greatly 

 swollen occipital region provided with a median keel. The type is in 

 very poor condition, the skin being largely denuded from head and body. 

 No traces remain of the scales, the pectoral and ventral fins are lost and 

 the others greatly mutilated. Enough remains, however, to demonstrate 

 that it is distinct from all known species and to furnish characters by 

 which the species may be recognized. The interorbital space is converted 

 into a very deep channel by 2 vertical thin lamellae which arise on 

 either side, and mark off the narrow interorbital space from the contigu- 

 ous supraocular areas. From the base of these vertical lamellae arise 

 externally the thin supraocular plates, which extend outward and upward 

 and roof over the orbit. A deep narrow channel is included between the 

 lamella? and the plates. The floor of the interorbital groove is raised 

 mesially into a sharp ridge, which is continuous anteriorly with the 

 ethmoidal ridge and posteriorly with a ridge running along middle of 

 occiput. On anterior half of occiput this ridge is a high strong keel; 

 posteriorly, it becomes lower and rounded. The occipital region is 

 swollen and prominent, much higher than the interorbital space. It is 

 bounded laterly by 2 strong rounded ridges Avhich originate at the 

 upper posterior margin of the orbit and converge rapidly backward. 

 The occipital cartilage is heavy and strong, not yielding readily to pres- 

 sure. The width of iuterorbital space is orbit; the distance between 

 outer margins of orbital plates above middle of eyes is f diameter of eye. 

 The opercle is marked with delicate striae diverging downward and 

 backward, but is without strong ridges. The front of dorsal is midway 

 between adipose fin and gill opening, slightly nearer base of caudal than 

 tip of snout. The fin contains 8 rays. Anal badly mutilated, containing 

 at least 24 rays. The mutilated condition of the type will not permit 

 further description. Length 155 mm. Cortez Banks off San Diego, Cali- 

 fornia, in deep water; known only from the type taken by the Albatross at 

 Station 3627, in 776 fathoms. (Named for Walter Miller, professor of 

 classical philology in Leland Stanford Jr. University, in recognition of his 

 intelligent interest in zoological nomenclature.) 

 3030 100 



