FISHES OF HAWAnAN ISLANDS. 



5S7 



til the Iki.siI lialf cif tlie rostrum, whii-li is mure robust than in Xii/iiclitlii/s, and wholly lacks thccharac-- 

 tcristic sni]if-likf aspi'ft of the lallci-; jaws tain'ring to very (Iclicatc slender tips, and closely apposed 

 for llieireutire length; lower jaw slightly longer than upper; gape extending to below posterior bonier 

 of rye; uiaxillaries terminating anteriorly at a point mi<l\vay lietween tip of snout and front of eye, the 

 anterior half of beak composed of tlie elongate vomer alone; teeth as in Xcinicjilliy:', all reduced lo 

 .small granular plates, arranged in (|uini'unx on tlu- jaws and vomer, eacli ending in a short acute tip 

 directed jiosteriorly; vomerine liand wide posteriorly, then tapering to a point oi)posile the nostrils; 

 maxillary and mandibular bands narrower than in Xi'iiilrhllii/t:, none of uiiper ban<l and only a narrow 

 sirip of the lower inserteil on the lateral aspect of the jaw; nostrils as in tScrriidiin-r, consisting of :.' 

 short slits, in front of the middle of eye, the anterior shorter than Ihe posterior; gill-slits long, very 

 oblique, confluent below, the memliiani's nniled inferiorly an<l frei" from the isthnnis; gills 4. As in 

 .Si'n-iroiiii'i; no lateral line can be detected. 



Dorsal and anal beginning at nearly the .same vertical, which is half the length of head lichinil 

 gill-opening; anterior dorsal rays extremely delicate and difficult to detect, none shortened or spine- 

 like; anal somewhat higher than dorsal, the rays longer and more crowded in the jiosterior iiortions 

 of l)oth fins. 



Upper half of body light grayish, covered with line black pigment sfiecks; the lower half of side 

 abruptly jet-black; head all black save tips (jf jaws and the oc-ciput, which are a little lighter; posterior 

 sixth of tail wliolly black; all the linslight-colon'd. 



A single specimen known. 



Nematoprora, new genus. 



Like Xriiiirlillii/s, but without jiores along the lateral line, and with pavement-like teeth which ilo 

 not bear backwardly-dire<'ted spinous tips, like those present in Xfinii-litlnja and related genera. 



Tail ending in a long filament; dorsal beginning on nape and without differentiated spinous 

 portion; anal origin immediately behind tips of pectorals; jaws exceedingly attenuate, recurved; the 

 nostrils are round pores, the posterior behind and above the anterior; branchial membranes are lorn 

 anteriorly in the type S]iecimen, lint the branchial clefts were apparently wide. 



Xrinat'iprnrn Gilhcrt, new genus nf Xi:'iuirlil/iifitl;r ipnh/nnuijtraj, 



Nematoprora polygonifera, new species. Fig. 234. 



Type, 31.T mm. long, from station 41.'il, vicinity of Hird Island, depth 31M to .SdO fathoms; No. 

 .Tl.'j89, U. S. Nat. Mus. 



Head 7.5 hundreilths of total length; greatest depth 2.2; least ilepth at nape 1 ; di.stance from tip 

 of snout to front of dorsal 7; frem tip of snout to vent S.5; length of snout -5.5. 



Greatest depth of body near middle of its total length; contours not approximately parallel for a 

 considerable portion of its length as in Xtiiili-hllK/.-!, hut converging gradually to the filiform tail, and 

 forward to the very narrow "neck :" head extremely sleiuler, little deeper tlitui the neck, alioni Ihree- 





Fif;. XU.—XcnMlupnirii iiiihjiiniiiji rn Gilliert. new sjiccios. Type. 



fifths the greatest depth of liody; eye small, in the posterior two-sevenths of head, its diameter twice 

 the width of the Hat interorliital space, a littlc> more than one-third the postorbital length of In^ad; 

 upper jaw a little longer than the lower, with no indication of mutilation; teeth pavement-like, with 

 slightly rounded surfaces, and arranged in oblique wries. 



L)orsal rays extremely delicate, the anterior very diort and slender tlirougliout, the median and 

 posterior rays loiigei", with a thicker base and a very attenuate tip. In a poorly preserved specimen. 



