DISCUSSION OF SPECIES AND THEIR DISTRII3UTIOX. .")2o 



The type species, D. frichhtnis, Alcock, is represeuted by a si)<>ciiiieii 7 uwAwa long, 

 with the end of the tail missing, obtained by the htrextifiiitor at station lOt, at a (h'ptb oC 

 1,000 fathoms. 



Another species, 1). mdanocephalus, was obtained from station 111, 1,044 fathoms, 

 and station 117, 1,748 fathoms, mature females about S inches long. [Alcock, Ann. and 

 Mag. Nat. Hist., 1891 (July), 31'.] 



NEOBYTHITES Goode and Bean. 

 Tetranematnpvs, Gunther, MS. 



Xedhiitliifrs. Gdode and Beax, Pror. IT. S. Nat. Miis., vin, 18«.5, (iOO.— GfNTiiER, Cballeiif;er Report, xxir, 

 1S87, 100.— Vaillant, E.\p. Sei. Travailleur et 'I'alismau. 282, (discus-siou nrnler Bythites cramis). 



Brotulids having the body elongate, compressed, covered with small scales, and the 

 liead also scaled. Lateral line incomplete, ol)solete posteriorly. Eye moderate. .Snout 

 moderate, rounded, slightly ])roduced, the lower Jaw slightly included. Xo barbel. Teeth 

 villiform, in narrow bands in jaws and palatines. Vomerine teeth in V-shaped patch. 

 Two weak spines at angle of preopercnlum, and a stronger one at the angle of the opercu- 

 lum. Gill-openings wide, the menil)ranes deeply cleft and not attached to the isthmus. 

 Vertical fins united. Ventrals reduced each to a bitid raj-. Branchiostegals, S. I'seudo- 

 branchise present, but small. Air-bladder present. Type, ¥eobythites Gillii. 



NEOBYTHITES GILLII, GoOde and Bean. (Figure 289.) 



NeohylliHen Gillii, Goodk and ISeax, Prot-. V. 8. Nat. Mus., viii, 18S."), (!01. — (irNXUER, Clialltnger Report, 



xxir, 1887, 103. 

 Xeobylhites oceUalus, Gcxther, toe. oil. and PL xxi, Fig. B. 



Body compressed, its height (17 millimeters) contained 4§ times in total length, and 

 less than length of head. Interorbital area convex, its width (.5 millimeters) equal to diam- 

 eter of circular eye, 3% in length of head and li in length of snout in young. 



Head compressed, deeper than broad, with wide sinuses, its length (18 milUmeters) 

 contained 4i times in that of body; snout obtusely rounded, slightly produced. Mouth 

 large, the maxillary extending considerably behind the vertical throngh posterior margin 

 of eye, expanded posteriorly; the mandible still longer, its length (11 millimeters) about 

 2J times in the height of the body. Interorbital space convex. Teeth in villiform bands 

 in the jaws and on the palatines. Vomerine patch subcircular, with angles exteutled 

 posteriorly. 



Gill-rakers moderately long and slender, somewhat nnmerous, the longest al)out two- 

 thirds the diameter of the eye; eleven developed and three rudiments below the angle. 

 Pseudobranchiai absent. Gill-opening wide, the membrane deeply cleft, free from the 

 isthmus behind. 



A single long, flat spine attached to the posterior portion of the operculum, high up, 

 extending back along to its edge; a small hidden spine at lower angh^ of preopercnlum. 



Nostrils small, the anterior one in a very short tube, almost upon the tip of the snout; 

 posterior nostril slightly larger, not tubular, immediately iu front of middle of eye. 



Scales moderate, upon head and on body, in SS verticnl rows, 7 rows between dorsal 

 origin and lateral line, which becomes obs(jlete in its posterior half; 10 or 17 fiom veut 

 forward to lateral line. 



Dorsal origin behind that of ventral and pectoral. Its distance from snont (121 milli- 

 meters) contained 4 times in total length. Its rays inoderately long. Anal origin uiitlei' 

 the eighteenth dorsal ray; its distance from snout (34 millimeters) contained 2.^ times in 

 body length. Rays rather slenderer than tho.se in the dorsal. The caudal rays are or 7 

 in number, their length (9 millimeters) contained 9 times in total length. They are not 

 diiferentiated from those of the adjacent tins. Pectoral origin well Ibrwaid. its base some 

 what concealed by the flap of the operculum; its length (13 millimeters) about e(iual to 

 two thirds that of head. Ventrals each a bifid ray, the inner filament the longer, inserted 

 slightly iu advance of the base of the pectoral and not far from humeral symphysis, and 



