DISCUSSION OF SPECIES AND THEIR DISTIUIUJTION. 341 



jaw iirojectiiig. Iiitermaxilliiry teoth nuliinentary; several faiifi-like teetli on tlie liead of 

 the vomer, none on palatines. A few rather lar.ue, reenrved, separated teetli in the mandi- 

 ble. Nostrils close together and small. Eye visible throngh the skin, ])artly upon the; tn\t 

 of the head, with or without dark piymeut in the iris. Barbel, none, (iillrakers very 

 numei'ous and slender, and rather long, (lill-lamina^ well de\eloi)ed on all the arches. No 

 pseudobranchia-. Head full of niuciferous channels. Gill inend)ranes not united, but 

 covered by a fold of skin. Veutrals reduced to single simple rays, ])laced in advance of th(^ 

 pectorals and close to the humeral symi)hysis. Dorsal and anal placed far back. 



Caudal scarcely differentiated, composed of rather niunerous very slender rays njion a 

 somewhat narrow base. 



BAEATHEONUS BICOLOE, Goor>K and Be.vx. (Figure 298.) 



Barathroniis hicolor, Goode and Bean, Bull. Mun. Conij). ZoiJl., xii, No. 5, KU, 7. 



Body much compressed, its greatest height (19 millimeters) contained G;^ times in the 

 total length. Head much thicker than body, its greatest width equal to § of its length (2',i 

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

 diameter of orbit about equal to width of interorbital area, and contained 4| times 

 iu length of the head. Maxilla extends slightly Ijeyond the i)eriH'n(licular through pos- 

 terior margin of orbit; it is almost entirely concealed under the, jjreorbital, and is much 

 exijanded at the tip, where its width is lather greater than that of the eye. Intermaxilla 

 very thin, broad, and .slightly protractile. 



Vomer very close to intermaxillary syni])hysis, its head somewhat raised and bearing.'? 

 faJig-like teetli (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 

 upon each side, which increase in size posteriorly; its upper edge, i)osteriorly, is produced 

 above the level of the tooth-bearing surface, and is received under the exitanded 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, nnmerous, long and slender, about 70 in number; the longest con- 

 tained about :') times in the length of head. 



The anal originates in vertical from fourteenth dorsal ray, e(iuidistant 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 t<i humeral symphysis, the rays being 

 placed very close together at their origin, the length of the lin (i:i nu'Ilimeters) contained 

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



The caudal lias about 10 rays; its length is contained about S tirai's in the total length. 



Color, yellowish white, with a broad vcitical band of black from the origin of ventral 

 nearly to the vent; another similar and nairower 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. 



Jphyovun, Gi'NTiraK, Ann. and Mag. Nat. Hist., 187K, ii, 22; Cballonsor Roport. xxii, 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 sw< .lien, 

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

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

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

 eye. Barbel none. Veutrals rediu-ed to sinqde filament.s, plac<-d close together and near 

 to the humeral symphysis. Gill-membranes not united. Eour. l.ranc'hial arches, the pos- 

 terior without gill-lamiuai ; the anterior with very short gill rakers and with rather short 



