FtSHES OF HAWAIIAN ISLANDS. 591 



they oxtontl well beyond the anal l)ase; in the Cdlype, to the base of the Uist ray; third ventral rav 

 divided, its (jnt.er half ])rodiieed and modified niueh as in the outer rays; distance from vent to anal lin 

 1.7 in distanee from insertion of ventrals. 



Color brownish blaek, the peetoral lilaiiieiits and tips (if cmter ventral rays white; month and 

 gill-eavities and the peritoneum blackish. 



The cotype is 200 mm. long, and was taken at station 4181, vicinity of Kanai, dejilli 1,(K)0 to 1,:U4 

 fathoms. 



Family MYCTOPnin.4;. 

 Nannobrachiuni nigrum ( iiinlher. 



Three small specimens in rather poor condition, having lost nmch of the integument, agree closely 

 with (iiinther's description and figure. Dorsal 14; anal Hi or 17; gill-rakers IS on outer arch; {'ye 

 somewhat larg<'r in our specimens, a trifle less than 5 I'atlier than 4 in head, longer than snout, and 

 exceeding also the longest gill-raker. While we do nut venture to distinguish the Hawaiian form on 

 the basisof the larger eye, there may exist other cliaraeters nut given by Gunther. The numVjer and 

 distribution of the luminous spots in tbe type of .V. iiir/ram remain wholly unknown. In the Hawaiian 

 specimens these are arrai)g<'d as follows: Manilibulars, 'i pairs, very inconsi>i<'nous; operculars, Imt 1 

 pair evident, poorly developed; pectorals, 4 pairs, 1 immediately below lateral line, 1 on pectoral base, 

 1 vertically below pectoral base and lialfway to median line, 1 on line between pectoral Iiase and first 

 thoracic pair; thoracics, 5 pairs, the fourth jiair high up on sides, over interspace between third and tift h 

 pairs, the lower pairs evenly spaced; sui^raventrals, 1 pair, immediately below lateral line; ventrals, 4 

 pairs, evenly spaced; supra-anals, ',i jiairs, 2 forming an oblique line upwanl and backward from vent, the 

 uppermost on the lateral line, the third well forward, over the interspace between sec'ond and third 

 ventrals, on a level with the fourth pair of thoracics; anals in 2 well-separateil series, the anterior 

 group with 6 pairs, of which the first 5 are in jiarallel lines, the sixth jilaced high, in a line joining the 

 fifth anal and the posterolateral; posterior series also with 6 jiairs; |:iosterolaterals, 1 pair, on the 

 lateral line; caudals 4, the anterior .'■! forming a right-angU'd or obtuse-angled triangle at base of lower 

 lobe, the fourth separated from the third by a wide interspace, jilaced on, or even a little above, the 

 enil of the lateral line; a luminous streak aliove and one below on caudal peduncle. 



In size and position of fins and in the arrangement of the photophores .V. nujrum shows great 

 re.semblance to the type o( Lainpam/dax, L. cmrodiluii (Risso). The 2 genera are distinguished only 

 by the reduction of the pectorals in XdnnohracJiium, a character of doubtful value. The pectorals are 

 narrow in our specimens, and consist of a few ('■> to (i) short rays. The body is uniformly black, the 

 fins black on basal portions. 



The species was taken at the following stations: No. 4108, Kaiwi ('haiin<4, 411 to 442 fatlioms; 

 4110, Kaiwi Channel, 449 to 460 fathoms. The type of .V. »/;//-io/i was taken .«oiitli nf tlie I'hilippine 

 Islanils, at a depth of 500 fathoms. 



Nauiiohraehiiim. nli/niin fiiintlior. Di't'p-sea Fislu-s. C'liallcii^^or. 1,SS7. l".i;t, jil. .^v2. lif;, B, south of ttie Ptiilippines. 



KEV TO nAW.\II.\N SI'ICCIES OK Dl.il'UtlS. 



a. No luminous areas about eye urolampus, p. 591 



aa. Luniiuous area coVL'riiiff entire snout rhviisorhiinchti^i, p. .VJ2 



ana. .\ narrow luminous streak atiove eye and one I>elo\v it addioiiuts, p. ;VJ'2 



Diaphus urolampus (iilbert <>»: Cramer. 



Onesi)ecimen from statifin 401(), viciinty of Kauai lsl:nid, depth .'iO.'i to obS fathoms. The types 

 were from 29o and 810 fathoms. 



Tlie species has the following characteristic disposition of the jjhotophores: Upper pectorals 

 immediately below lateral line, the supraventrals, upper supra-anals, and posterolaterals in contact with 

 the lateral line; the fourth thora<'ics high on sides, on a level with |iectoral base; second and third 

 ventrals elevated, on the same level, a little abovi^ ventral base; supra-anals 2, forming a slightly 

 oblii|iie line which traverses the fifth ventrals; first anal (interpreted as one of the .sttpra-anals in the 

 description cited below) elevated, nearly vertically above the second; the second to sixth anals forming 



F.c.n. l',)l«. I't. ■2—2 



