164 BULLETIN OF THE 
BARATHRONUS, n. gen. 
Head stout, body and tail compressed, covered closely by skin, scaleless. 
Vent far behind pectoral, included in a cleft. Mouth wide, oblique, the lower 
jaw projecting. Intermaxillary teeth rudimentary ; several fang-like teeth 
on the head of the vomer, none on palatines. A few rather large recurved, 
separated teeth in the mandible. WNostrils close together and small. Eye 
visible through the skin, partly upon the top of the head, with or without 
dark pigment in the iris. Barbel none. Gill-rakers very numerous and slender, 
and rather long. Gill-laminz well developed on all the arches. No pseudo- 
branchiz. Head full of muciferous channels. Gill-membranes not united, but 
covered by a fold of skin. Ventrals reduced to single simple rays, placed in 
advance of the pectorals and close to the humeral symphysis. Dorsal and anal 
placed far back. 
Caudal scarcely differentiated, composed of rather numerous very slender 
rays upon a somewhat narrow base. 
Barathronus bicolor, n. sp. 
The type is an individual, 120 mm. long, from “ Blake” Station Lxx1., off 
Guadaloupe, at a depth of 769 fathoms. 
Body much compressed, its greatest height (19 mm.) contained 63 times in 
the total length. Head much thicker than body, its greatest width equal to 2 
of its length (23 mm.), which is contained 5} times in the total length. Eye 
concealed by the skin ; diameter of orbit about equal to width of interorbital 
area, and contained 42 times in length of the head. Maxilla extends slightly 
beyond the perpendicular through posterior margin of orbit; it is almost 
entirely concealed under the preorbital, and is much expanded at the tip, 
where its width is rather greater than that of the eye. Intermaxilla very 
thin, broad, and slightly protractile. 
Vomer very close to intermaxillary symphysis, its head somewhat raised and 
bearing three fang-like teeth (two of which are on one side and one on the 
other, in the type separated by a moderately wide interspace). The mandible 
has five enlarged, separate, recurved teeth upon each side, which increase in 
size posteriorly ; its upper edge, posteriorly, is produced above the level of the 
tooth-bearing surface, and is received under the expanded maxilla. The long- 
est gill-raker is about as long as the eye. The dorsal origin is distant from the 
snout (54 mm.), which is contained slightly less than twice in the total length. 
Its rays are well developed, numerous, long and slender, about 70 in number ; 
the longest contained about 3 times in the length of head. 
The anal originates in vertical from fourteenth dorsal ray, equidistant be- 
tween eye and base of caudal. It contains 57 rays, about as long as those in 
the dorsal. 
The pectoral with a fleshy base, its length (18 mm.) a little less than height 
of body. 
