DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 75 



of eye. Eye large, nearly two-fifths lengtb 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 rout of 

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

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

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

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

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



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

 over middle of anal tin, 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 upou the lateral line; the second far behind the 

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

 phores. Superanals 7 + G. Radial formula: D. 12; A. 21-22; L.lat. 38-42. 



This species is closely related to, if not identical with, .1/. Rygomii of Liitken. If they 

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



This species is described from eight specimens (No. 4.3702, U. S. N. M.) obtained at the 

 surface by the steamer Albatross at station 257.'!, in 40° 34' IS" N. lat., 04° 09' W. Ion. 

 They were attracted by the electric light. The largest example is 75, and the smallest 56 

 millimeters in length. Six specimens (No. 3S193, U. S. N. M.) were also taken by the Alba- 

 tross at the surface at 7 p. m. at station 2727, in 36° 35' N. lat., 74° 03' 30" W. Ion.; speci- 

 mens (No. 33482, U. S. N. M.) from station 2073, in 41° 54' 15" N. lat., 65° 3<)' w. Ion., taken 

 at the surface; No. 38171, V. S. N. M., from station 2724, in 36 c 17' X. hit., 73° 25' VV. Ion., 

 at a depth of 1,041 fathoms; No. 4370.°,, TJ. S. N. M., from station 2742, in 37° 46' 30" X. 

 lat., 73-2 56' 30" W. Ion., in 865 fathoms; No. 43074, U. S. N. M., from station 2731, in 

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

 station 2719, in 38° 29' N. lat., 71° 58" W. Ion., at a depth of 1,536 fathoms. 



The. Fish Ho irk also obtained three examples (No. 28942, U. S. N. M.) from station 

 1034, in 39o 50' N. hit., 69° 20' W. Ion., at a, depth of 140 fathoms. 



MVCTOPHUM HYGOMII, (Lutren), (i e and Bean. 



Seopelm Hygomii, Li'tkex. Spolia Atlantica, n. 1892, 257, fig. 15. 



A species closely related to 3L remiger, (loode and Bean, if not identical with it, the 

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

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

 origin of the ventral, the posterior and lower one above the second post- ventral photophore. 

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

 either the most advanced of the mediolaterals or the vertical from the vent. The postero- 

 laterals are much closer together than in M. remiger, and the precaudals 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. remiger. Number of superanals 7+6 or 5-6+6. 



Radial formula: 1). 12; A. 19; P. 14; Y. 8. 



Liitken had specimens from the following localities: N. lat. 38°, "VV. Ion. 22° 20'; S. lat. 

 35° 12', E. Ion. 26°; S. lat. 39° 54', E. Ion. 41° 30'; between S. lat. 23° 30', E. Ion. 81°, and 

 S. lat, 24° 30', E.lon.75° 50'. 



BENTHOSEMA, Goode and Bean. 



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

 shorter than tha 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 



