DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 341 



jaw projecting, [ntermaxiUary teeth rudimentary; several Fang-like teeth on the head of 

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

 ble. Nostrils close together and small. Bye 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-laminae well developed on all the arches. No 

 pseudobranchiae. Head full of muciferous channels, Gill membranes nol united, but 

 covered by a fold of skin. Ventrals reduced to single simple rays, placed in advance of the 

 pectoralsand close to the humeral symphysis. Dorsal and anal placed far back. 



Caudal scarceh differentiated, composed of rather numerous vcr\ slender rays upon a 

 somewhat narrow base. 



BAKATHUONUS BICOLt >R, <; i: and Bean. (Figure 298.) 



Barathronus bieolor, Goode and Bean, Bull. Mus. Comp. Zool., mi. No. r>, 164, 7. 



Body much compressed, its greatest height (19 millimeters) contained <>i times in the 

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

 millimeters), 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 I | times 

 in length of the. head. Maxilla extends slightly beyond the perpendicular through pos- 

 terior 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 3 

 fang like teeth {'1 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 

 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 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 the total length. The 



rays are well developed, numerous, long and slender, about 7l> in number; the longest < 



tabled about •'! times m the length of head. 



The anal originates in vertical from fourteenth dorsal ray, equidistant, from 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 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) < tained 



about '•» times in the total length, about 3 times in distance from its origin to the vent. 



The caudal has about 10 rays; its length is contained about 8 times in the total length. 



Color, yellowish white, with a broad vertical band 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, li'O millimeters long, from Blake station lxxi, off Guada 

 loupe, at a depth of 7(S!» fathoms. 



APHYONUS, Gunther. 



Aphyonus, GDnther, Arm. and Mag. Nat. Hist., 1878, u. 22; Challenger Report, xxu, 1887, 120. 



Head, 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 length. Snout swollen, 

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

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

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

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

 to the humeral symphysis. Cillineinbranes not united. Four branchial arches, the pos 

 terior without gill lamina'; the anterior with very short gill rakers and with rather short 



