DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 341 



jaw i^rojcctiiig. Intermaxillary teeth i-iidimentary; several laiig-like teeth on the head of 

 the vomer, none on palatines. A few rather large, recurved, sejjarated teeth in the mandi- 

 ble. Nostrils close together and small. Eye visible through tlie 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-laminte well developed on all the arches. No 

 pseudobranchia\ 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 symjjhysis. Dorsal and anal placed far back. 



Caudal scarcely differentiated, composed of rather numerous very slender rays upon a 

 somewhat narrow base. 



BAEATHEONUS BICOLOE, Goodk and Bean. (Figure 298.) 

 Barathromis Ucolor, GooDE and Bean, Bull. Mus. Comp. Zool., xii, No. 5, 164, 7. 



Body much compressed, its greatest height (19 millimeters) contained 6J times in the 

 total length. Head much thicker than body, its greatest width equal to § of its length (23 

 millimeters), which is contained Si times in the total length. Eye concealed by the skin; 

 diameter of orbit about equal to width of iiiterorl)ital area, and contained 4f times 

 in length of the head. Maxilla extends slightly beyond tlie perpendi(!ular through pos- 

 terior margin of orbit; it is almost entirely concealed under tlie 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 proti-actile. 



Vomer very close to intermaxillary symphysis, its head somewhat raised and bearing 3 

 fang-like teeth (2 of which are off one side and 1 on the other in the type, separated by a 

 moderately wide interspace). The mandible has five enlarged, separate, recurved teeth 

 iil)on each side, which increase in size posteriori}-; its upper edge, posteriorly, is produced 

 above the level of the tooth-bearing surface, and is received under the expanded maxilla. 

 The longest gill-raker is about as long as the eye. The dorsal origin is distant from the 

 snout (54 millimeters), which is contained slightly less than twice in tlie total length. . Tlie 

 rays are well developed, numerous, long and slender, about 70 in number; the longest con- 

 tained about 3 times in the length ol' head. 



The anal originates in vertical from fourteenth dorsal ray, equidistant from ej'e 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 millimeters) a little less than height of 

 body. 



The ventral well in advance of pectoral, close to humeral symphysis, the rays being 

 placed very close together at their origin, the length of the fin (13 millimeters) (contained 

 about 9 times in the total length, about 3 times in distance from its origin to the vent. 



Tlie caudal has about 10 rays; its length is contained about S timers in the total length. 



Color, yellowisli white, with a broad vertical baud of black from the origin of ventral 

 nearly to the vent; another similar and narrower band above it upon each side. 



The type is an individual, 120 millimeters long, from Blake station Lxxi, off Guada- 

 loupe, at a depth of 709 fathoms. 



APHYONUS, Gunther. 



Apkyomts, Gi'NTiraR, Ann. anil Mag. Nat. Hist., 1878, il, 22; Challenger Report, xxii, 1887, 120. 



ITead, body, and tapering tail strongly compressed, enveloped in a thin, scaleless, loose 

 skin. Vent far behind the pectoral in nearly the middle of the total lengtli. Snout swollen, 

 projecting beyond the mouth, which is wide. No teeth in the upper jaw; small conical 

 teeth in the lower, jiiuriserial in front and uniserial on the side. Vomer with a few rudi- 

 mentary teeth; palatine teeth none. Nostrils close together, small. No externally visible 

 eye. Barbel none. Ventrals reduced to simple filamcuts, placed close together and near 

 to the humeral symphy.sis. Gill-membranes not united. Four branchial arches, the i>os- 

 terior without gill-lamina^; the anterior with very short gill-rakers and witli rather short 



