164 BULLETIN OF THE 



BARATHRONUS, n. gen. 



Head stout, body and tail compressed, covered closely by skin, scaleless. 

 Vent far bahind pectoral, included in a cleft. Mouth wide, oblique, the lower 

 jaw projecting. Intermaxillary teeth rudimentary ; several fang-like teeth 

 on the heat! of the vomer, none on palatines. A few rather large recurved, 

 separated teeth in the mandible. Nostrils 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-laminoe well developed on all the arches. No pseudo- 

 branchiae. Head full of muciferous channels. Gill-raembranes 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. 



Baxathronus bicolor, n. sp. 



The type is an individual, 120 mm. long, from "Blake" Station lxxl, oflF 

 Guadaloupe, at a depth of 769 fathoms. 



Body much compressed, its greatest height (19 mm.) contained 6J times in 

 the total length. Head much thicker than body, its greatest width equal to f 

 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 4| 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. 



