DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 75 



of eye. Eye large, nearly two fifths length of the head. Intermaxillary' reaches as far 

 back as maxillary, nearly to angle of the preoperculum. Maxillary expanded posteriorly 

 and concealed under large scales of cheek. Space between eye and hinder edge of pre- 

 operculum one-third diameter of the eye. Origin of dorsal nearer tip of snout than root of 

 caudal, being over eleventh scale of lateral line, aud nearly over origin of ventral. Base of 

 dorsal two-thirds as long as head, aud length of longest ray equals length of head without 

 snout. Ventral does not quite reach vent. Pectoral as long as head, and reaches to above 

 anal origin. Anal origin nearly under end of dorsal base. The lengtli of anal base is a 

 little greater than that of head. Caudal rather small aiul forked. 



Posterolaterals, 2, over break in superaual series and far apart, the anterior one, nearly 

 over middle of anal fin, the posterior one about one scale in advance of the vertical from 

 the root of the soft dorsal. Anterolaterals widely separated, the first obliquely in advance 

 of and above the second, and touching or upon the lateral hue; the second far behind the 

 root of the ventral and over the interval between the first and second postventral photo- 

 phores. Superanals 7 + 0. Radial formula: I). IL'; A. 21-L*li; L. Jat. .3S-42. 



This species is closely related to, if not identical with, M. Hi/yomii of Liitkeu. If they 

 prove to be identical, Liitken's name has priority. 



This species is described from eight specimens (No. JtSTO^, U. S. N. M.) obtained nt the 

 surface by the steamer Alhatrofis at station 257:!, in 4(to 34' IS" N. lat., (U'^ 09 W. Ion. 

 They were attracted by the electric light. The largest example is 75, and the smallest 50 

 millimeters in length. Six specimens (So. 3819:*., IT. S. K M.) were also taken by the AJha- 

 tross at the surface at 7 p. m. at station 2727, in 3CP ;>5' N. lat., 74° 03' .30" W. Ion.; speci- 

 mens (No. 33482, TJ. S. N. M.) from station 2073, in 41° 54' 15" N. lat., 05© 39' W. h)n., taken 

 at the surface; No. 38171, U. S. N. M., from station 2724, in 30^ 47' N. lat., 73° 25' W. Ion., 

 at a depth of 1,041 fathoms; No. 43703, F. S. N. M., from station 2742, in 37° 40' 30" N. 

 lat., 73° .50' 30" W. Ion., in 8(15 fathoms; No. 43974, U. S. N. M., from station 2731, in 

 30O 45' N. lat., 74° 28' 30" W. Ion. (probably at surface); and No. 43795, U. S. N. M., from 

 station 2719, in 38© 29' N. lat., 71° 58" W. Ion., at a depth of 1,5.30 fathoms. 



The Fish Han-l- also obtained three examples (No. 28942, \J. S. N. lAI.) from station 

 1034, in 39-^ 50' N. lat., 09° 2(i' W. Ion., at a depth of 140 fathoms. 



MYCTOPHUM HYGOMII, (Litkkn), Goode and Bean. 

 Scopelns Uygomii, Lutkex, Spolia Atlautica, ii, 1892, 257, fig. 1.5. 



A species closely related to M. rcmigcr, Goode and Bean, if not identical with it, the 

 arrangement of the photophores being very nearly the same, except that the anterolaterals 

 are somewhat more widely separated vertically, the anterior and upper one being above the 

 origin of the ventral, the posterior aud lower one above the second jiost- ventral photophore. 

 The pectoral, though long and falcate, does not extend so far back, not closely apjaoaching 

 either the most advanced of the mediolaterals or the vertical from the vent. The i)Ostero- 

 laterals are much closer together than in M. rcmigcr, and the prccaudals farther apart, the 

 posterior one being relatively higher and placed nearly upon the extremity of the lateral 

 line, instead of being quite below it, as in M. rcmigcr. Number of superanals 7+0 or .5-0 + 0. 



Padial formula: I). 12; A. 19; P. 14; V. 8. 



Liitkeu had specimens from the following localities: N. lat. 38°, W. Ion. 22° 20'; S. lat. 

 350 12', E. Ion. 20O; S. lat. 39° .54', E. Ion. 41° .".O'; between S. lat. 23^ 30', E. Ion. Sjo, and 

 S. lat. 240 30', E. Ion. 75° 50'. 



BENTHOSEMA, Goode and Bean. 



This form dilfers from the typical Myctophum by the fact that the dorsal is considerably 

 shorter than ths anal, but overlaps it, reaching to the vertical from the middle. It has the 

 body elongate, the caudal peduncle somewhat stout, the eyes large, the snout very short, 

 with declivous upper profile; maxillaries considerably dilated behind; scales of the lateral 



