604 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



middle of these rays, the tliird at a higher level, opposite the middle of the developed rays of lower 

 lohe; a single small glandular patch on the liack of the tail and 2 much larger ones below, each with a 

 curved band of black pigment along its posterior margin. In addition to these there are along the sides 

 numerous much smaller photophores, probably of simpler structure, arranged in definite series, each 

 of these organs appearing as a light central dot surrounded liy a narrow black ring. In one .series they 

 are arranged intersegmentally along the mid-lateral Fine; aljove and below this are two ]iarallel lateral 

 series, equally spaced, the sjiots in each series .seginentally arranged and ,so disposed that they form 

 with those i>f the other series oliliquely transverse lines, tho.se above the lateral line running uiiward 

 and backward, those below, downward and liackward. Others are disposeil along the luick and on the 

 sides of the head, where no definite arrangement has been detected. 



General color lirownish black above, jet-black below; fins finely sjieckled, the pigment spots on 

 rays of vertical tins usually arranged in cross-lines, which often correspon<l to the articulations of the 

 rays. In life the glandular portions of all the jiliotophores were brilliant ruby-red, including the 

 lower portions of tlie upi)cr lateral mw, the Inwcr purtioii of the subocnlar spot, the preopercular 

 spot (surrounded by a silvery line), and the patches on upper and lower sides of caudal jieduncle. 



.Stomach deeply ciccal, the sac sharply tapering to its posterior end, extending one-third the length 

 of the abdominal cavity; pyloric cteca lai-ge, 6 in number. 



Specimens were taken at stations Nos. 4019, vicinity of Kauai, 409 to S.W fathoms, and 410^i, Kaiwi 

 Channel, 411 to 44L! fathoms. 



Cyclothone canina, new species. Plate 71, tig. 2. 



Type, 38 mm. long, from station 4()0.i, vicinity nf Kauai Island, depth 4S0 to .")77 fathoms; type, No. 

 .')1.')45, U. S. Nat. Mus. 



Differing from other species of the '■ inirnuldii " group in the <levelopment of 3 pairs of slender 

 canines near the mandibular symphysis. Tliere are al.«i> other cliaracteri.xtic details of dentition, and 

 minor differences in the proportions ui tlie lias, the dorsal being a little larger, the anal a little shorter 

 than in other species. 



Length to base of caudal GO nun. ; head 22 hundredths of this length; snout .".5; intcrorbital width 

 3; distance from tiji of snout to end of maxillary 19; length of mandible 20; greatest de|)th of body 14; 

 least depth of cauilal peduncle 5; distance from tij) of snout to front of dorsal 59; length of <lorsal 20; 

 distance from last dorsal ray to base of noddle caudal rays 22; distance between piectorals and ventrals 

 22.5; from axil of ventrals to front of anal 14; length of anal ba.se 27; distance from last anal ray to 

 base of middle caudal rays 15; length nf pectorals 12; length of ventrals 9; distance from ventrals to 

 vent 5. D. 14; A. IH (rarely 19); P. Ill; V. 7; liranchiostegals 14; gillrakers9 — 15 or Kion outerarch. 



Mandible acute and jimjecting well beyond jireuiaxillaries; teeth of mandibular series minute 

 anteriorly, incniasing in size along miiidle and posterior portion of jaw, 2 or 3 of the posterior teeth 

 again <iiminishing; teeth not enlarged at intervals along the sides of the jaw, nearly erect, and num- 

 bering about loO in each ranuis; near the synqihysis are 3 pairs of curved canines, the anterior ]iair 

 smallest, the posterior largest; 3 pairs of similar iiu-urved canines opposed to them in the premaxil- 

 laries, shorter than those in the mandible, the posterior again the largest; maxillary teeth increasing 

 in length po.steriorly, 2 or 3 of the posterior teeth again smaller; about 80 teeth in each ma.xillary, none 

 of them greatly incline<l forward, and none of them nmch larger than the corresponding mandibular 

 teeth; every sccontl or third tooth along middle and jiogterior part of the maxillarya little longerthan 

 the others, with the point turned downward; vomerine teeth forming 2 series gently converging for- 

 ward, regularly increasing in size posteriorly, usually 3 in each series; palatine teeth confined to the 

 anterior end, in 2 small detached groups, the anterior consisting of a moderate canine with 2 minute 

 teeth to one si<le, which are detected with dilliculty; posterior group consisting of 2 anterior teeth 

 directed inward toward the middle line, and 2 or 3 others directed backward, the first of each set 

 enlarged, all arranged in a single line; j>terygoid teeth all small, forming a single, somewhat irregular 

 series; gill-lamin;e much shorter than in related species, their length less than the width of the arch 

 to wliich they are attached; outer set of gill-rakers extremely long and slender, inner set shorter, 

 fixed in an upright position. 



.\n occasional large scale is still attached to sides of body in one of the cotypes. There is no adi- 

 po.se fin. 



