FISHES OF HAWAIIAN ISLANDS. 5V)3 



Diameter of eye longer than snout, but sliorter than intei'orljital width; maxillary very long and 

 narrow, extending far behind nnddle of liead, its posterior portion not at all widened; both premaxil- 

 lary and mandible armed with broad bands of fine dei)ressible teeth, which extend over the outer as 

 well as the inner margins of the jaws; two small sei)arate vomerine patches, one on each side of 

 median line, a long narrow palatine band, and a longer broader pterygoid band, paralUd to palatine 

 band and exteiKling farther backward; gill-rakers long and slender, 5 — 13 in lunnber, tuothed along 

 their inner margins, the longest two-thirds tlie diameter of orbit. 



Insertion of iii-st dorsal and the outer ventral rays in the same vertical; base of last dursal ray 

 vertically above vent; front of adipose fin over last, anal niy; pectoral reaching fourth thoracic jihoto- 

 phore, the inner ventral rays barely reaching vent. 



Scales caducous, all having fallen in the type. In one of the cotypea a few scales remain, which 

 show that those of the lateral line are not enlarged, ami that all have entire edges. 



As in other species of Diaphus, the fourth thoracic photophore is elevated laterally to a point on a 

 level with the base of the pectoral tin; the third ventral photophore is on the .same level, the second 

 ventral forming with the first and third an oblicpie line extending upward and backwanl; supra- 

 ventral high, slightly nearer lateral line than base of ventral; supra-anals 3 in number, forming 

 an obliciue line from just before vent to lateral line, the upper supra-anal innnediately below the 

 lateral line, widely separated from second supra-anal; first anal remote from anal base, on a line join- 

 ing second anal with upper supra-anal; second, third, and fourth anals lie near base of anal fin, the 

 fifth and sixth diverging in a curved line whicli inchiiles the single posterolateral; the latter is sepa- 

 rated from the lateral line by one-fourth its tlistance from the anal base; five jjosterior anals in a 

 straight line along anterior half of caudal peduncle; caudals 4 in number, equidistant in a curve at base 

 of lower caudal lobe, the upper si^ot well below middle of caudal base; jiectorals 3 in number, the 

 upper at tip of opercular flap, the lower intermediate between the first thoracic and the spot at base 

 of pectoral; a narrow huuinous (golden) streak on upper orbital rim, and one along anterior half of 

 lower margin, lioth of them conspicuously margined with black; no luminous patches on tail; a semi- 

 circular white glandular l.)ody between pectoral base an<l upper pectoral spot, similar to tlie one occu- 

 pying the same position in D. theta. The division of the photophores can be made out only where 

 they still lie protected beneath the scales. 



General color dusky, the ba.ses of all the fins except the ])ectoral black; anterior clorsal and anal 

 fin blackish; opercle black, cheek silvery, snout whitish; interorbital space black, except a small 

 whitish median area; a broad black suljocular Ijar, from whicli a narrow black ring encircles anterior 

 half of orbit; gular membrane black, its anterior portion violet; a black bar near tip of mandible, and 

 one across mandible below' eye; lining of buccal and gill-cavities and the peritoneum black. 



The condition of all the specimens indicated that they entered the dredge near the bottom. They 

 were taken at the following stations: No. 3920, off south coast of Oahu, 265 to 2S0 fathoms; 401."i, 

 vicinity of Kauai, 31S to 362 fathoms; 4106, Kaiwi Channel, 335 to 3.50 fathoms. 



This species resend)les D. niijrmdis Giinther, from the I'hilippincs, but differs in the darker colora- 

 tion, the different shape of the circumocidar luminous patches, and the bighei- jiosition of the upper 

 supra-anal and the posterolateral photophores. 



Centrobranchus iMiwIer. 



Allied to RhinoKcopelns, but without lateral line and with the gill-rakers obsolescent. The slender 

 snout protrudes far beyond the premaxillaries, and is hollowed out on each side to form a conspicuous 

 nasal cavity, whi<'h is entirely roofed over by the expanded preorlntals; the.se are strongly convex 

 outwards and cover the entire lateral portions of the snont, joirnng superiorly and anteriorly the mid- 

 rostral ridge, and in contact below with the j)rcinaxillaries; their posterior margin is notched to give 

 passage to the na,sal openings; gill-rakers redui'cd to a few rudiments near angle of arch; photophores 

 arranged as in lihinoscopelus and Mijctoplmm, all those of the lower series forming i>arallel rows, none of 

 them elevated on the sides, and the caudal photophores but 2 in nund)er. 



Cattrobranclms Fowler, Proc. Ac. Nat. Sci. I'liilu., 1U03 Umi. Ui, 1'.I04), 754 (clucroccpludus). 



