DISCUSSION OK SPECIES AND ill ill; DISTRIBUTION. 40!> 



length of head : V. 1 1 : P. 13; height 7 in total : head 6. Interorbital area 2| in head, equal 

 to eye. Snout 4§ in head. Teeth in villiform bands. <iill rakersverj short, minute, about 

 L8 below the angle. No pseudobranehiae. Barbel ~.\ in eye. 



The type, number .'i7.">.">7. is ;i young specimen, 162 millimeters long, obtained by the 

 Albatross al station 2398, N. hit. 28 16 . W. long. 86 26', al a deptL of 227 fathoms. 



LIONURUS, Guntrv i 



lionurnt (as subgenus), GCnther, Challenger Report, wii. 124. 



A genus resembling Macrurus, but with imbricated, smooth, and flaccid scales; soft, 

 cavernous bones; small eye: filamentous ventral ray; minute barbel, and projecting, pointed 

 snout. A characteristic bathybial type. 



< liiutlier's Macrurus microlepis, (loc. cit.) from off Matuku, Fiji Islands, 315 fathoms, is 

 provisionally referred by him t<> this division, though based upon immature specimens. 



Lionurus liolepis, Gilbert (Proc. TJ. S. Nat. Mus., xiii, 1890, 117), was taken bythe 

 Albatross, oft the coast of California, in <»0;$ fathoms. 



LIONURUS FILICAl'DA. GCnther. (Figure 342.) 



Corypliosnoides (Lionurus) filicauda, GCnther, Aim. and Mag. Nat. Hist., 1878; Challenger Report, xxn, 27, 

 pi. xxxiv. lig. B. 



Snout considerably projecting beyond the mouth, pointed in the middle; it is twice as 

 long as the eye. which is unusually small, only half as wide as the interorbital space. 

 Mouth rather wide, extending beyond the center of the eye. Upper teeth villiform, in a 

 very narrow band, those of the inaudible very small, biserial. Barbel minute. Praeoper- 

 eulum with the angle produced backwards, broadly rounded and crenulated on the margin. 

 The terminal portion of the tail is prolonged into a long filament, more slender than in 

 any of the other species. Bones of the head soft. 



Scales of moderate size, thin, cycloid, and deciduous; six or seven in a transverse 

 series between the first dorsal spine and the lateral line; snout and inferior half of the 

 infraorbital region naked. The second dorsal spine slender, with the barbs in front very 

 inconspicuous and sometimes entirely absent. The distance between the two dorsal fins is 

 less than the length of the head. The outer ventral ray produced into a short filament. 

 Distance between vent and isthmus less than the length of the head. 



Head and trunk whitish, tail brownish, lower part of the head and gill-opening black. 

 [Ounther.) 



Radial formula: D. 11; P. 20; V. 9; Case. pyl. 7. 



The. Challenger obtained this species from the Antarctic Ocean and from the deep sea 

 on both sides of the South American Continent: from station 325, at a depth of 2,650 

 fathoms; from station 323, at a depth of 1,900 fathoms: from station 299, at a depth of 2,160 

 fathoms; from station 158, at a depth of 1,800 fathoms; from station l.">7, at a depth of 1,950 

 fathoms, and from station 146, at a depth of 1,375 fathoms. 



Dr. Giinther holds that this species is clearly one of those of the family which extend to 

 the greatest depths, since the small eye, the soft bones, the lack of firmness in the scales, 

 and the filamentous tail indicate its abyssal abode. 



TRACHONURUS, Giinther. 

 Trackonurus (as subgenus), GCnther, Challenger Report, xxn. 1887, 124. 



A genus resembling Macrurus in form and dentition, but with incomplete squamation, 

 the skin being densely studded with elect spines, strongest at the bases of the vertical 

 fins, space between the vent and ventral scaleless; snout short, compressed; interorbital 

 ridge obsolete; mouth small, lateral. 



In addition to the type species, .1/. oillosus, Giinther (Challenger Eeport, wii. 1 12, pi. 

 xxxvi, lig. B) from Japan, 345 fathoms, and the Philippines, 500 fathoms, our Malacocephalus 

 sulcatus appears to belong to this group. 



