608 



BULLETIN OF THE UNITED STATES FISH COMMISSION. 



Body f'ldiifiate. rmnpret-sed, deepest at nape, theiK'e taperiiiir ficrilly to the very narrow caudal 

 |iedunrle; headlong, posteriorly eoniiiren^ied: snout long and sliarp; eye in post<-rior half of liead, its 

 vertical diameter e>rt-ee<ling the horizontal diameter; interorbital S]iace and occiput nearly Hat; a pair 

 of low ridges ahove each orbit; mandible included within margins of upper jaw. tiie latter transversely 

 arched to receive it; the rounded end of mandible upturned to tit into an eniargination of tlie pre- 

 niaxillaries; premaxillaries narrow, closely a)iposed to maxillaries, which fail to reach the vertical 

 from fnuit of i-ve; about half tin' width of the narrow mavillary for its entire length slijis under the 

 free margin of the preorbital, which continues as a conspicu(jus fold to below front of eye; up|ier 

 jaw nonprotractile; the anterior arched portion of the premaxillaries toothless; near the front, on each 

 siile, is a long, depressible canine, jireceded by a much sujaller depressible tooth; liehind these, after 

 a short toothless interval, is a single series of short, lixed, bramble-like teeth, hooked backward, 

 growing minute toward angle of mouth; all of the pi'emaxillary teeth shut outside the mandible; 

 mandibular teeth in 2 series, an outer row i>f short, fixed teeth and an equal nnndier of inner, long, 

 fang-like canines, which are depressible; the canines are widely spaced, about s in number on each 

 ,side; palatine teeth similar, arranged in al)out 5 pairs, each consisting of an onlci-, Nhort. fixeil tooth 

 and an inner, depre.ssible fang, t)ie middle fangs on each side a little the longest; vomer toothless; on 

 each side of middle of tongue a lengthwise .series of small, depressible teeth hooked backward; anterior 

 nostril very small, closed from in front by a .short, triangular fia|>; it is ])laced high and is distant from 

 eye 0.3 the length of snout; po.sterior nostril a horizontal slit midway between anterioi- nostril and eye, 

 and slightly above middle of orbit; gills 4 in number, with a slit beliiml fourth aich; gill-rakers 

 repre.sented by series of short, shar]i spines i>n each arch; p.'^emiobrauchia' well developeil, occupying 

 a po<'k,'t made by a fold of the membranous lining of the cheek and a ligamentous band frjm upj.-r 

 end of outer gill-arch ; snbocular photophore small, Imt wi'li ilevelopeil. 



H l l l |ll | i;i> ll .J« ll lt)),„)jj.l_n , y:^,, 



l* ' .ijjj.>- ' . !P ig ^ ,^^.yj! ? »/f-'gA^ ! .t^yi ' .f.^, i >^ ^^ 



Fig. 2'M'>. — LtMidiiim niiiUnn Gilbert, uqw si'Gcifs. Type. 



t'pjier margin of pectoral but little below axis of body; longest rays two-fifths length of head; 

 veiitrals ijiserted midway between base of caudal and front of jiosterjor nostril; froid of dorsal well 

 behind insertion of ventrals, behind niidille of trunk a distance e<|ualing hah' diameter of pupil; 

 <'audal forked, its lower lobe recairrent along lower line of caudal jieduncle, with w(ll-de\c '.oped ra\s 

 wdiich reach to ba.se of anal; vent overlaiijied by the short ventral fins, and distant from front of anal 

 a distance about equaling length of anal liase; ailipose fin small, inserted above last anal rays. 



The type was in )ierfect condition when taken, and showed no trace of scales or scale-pouches on 

 the head or boily. The lateral line is a wide tube, inclo.sed liy a si'ries (jf small scales which are 

 wholly endiedded and concealed. It does not open through tubes which peiu'trate the scales, but 

 through mimite pores occurring in groups of .'i, above au<l below the scales. Posteriorly the scales 

 diminish in size, and disappear, together with the lateral tube, o[iposite middle of anal fin. 



Color translucent, with faint silvery luster; liack a little darker; a Y-shaped blackish mark on 

 occiput and nape; sides of snout and gill-membranes blackish; opercles largely bright silvery; a 

 narrow black crescent arovind upper and lower contours of eye-ball; a narrow silvery streak anteriorly 

 on each side of median line of alidomen, each streak with an inner line of coarse black specks; 

 caudal peiluucle washed with blackish and silvery, this area extending forward to middle of anal, but 

 leavitig a narrow translucent area above and below it; jieritoneum and lining of opercles largely black; 

 fins largely translucent; caudal a little dusky; anterior anal rays black-)>unctate at base; ventrals 

 each with a small bhu'k liasal spot. 



Only the type specimen known; possibly <'aptured by the traw 1 near the siu'faee. 



