274 DISCOVERY REPORTS 



Hab. North and South Atlantic. 



This species differs from all the others in its lighter coloration, and was actually taken 

 in shallower water than any of the remaining specimens of Bathylagiis collected by the 

 'Discovery'. It may be distinguished from all except B. milleri by the more posterior 

 insertion of the dorsal fin. 



Bathylagus milleri, Jordan and Evermann. 



Jordan and Evermann, 1898, Bull. U.S. Nat. Mus. xlvii (3), p. 2825. 



Hab. Cortez Banks, off San Diego, California ; 776 fathoms. 

 Known only from the much mutilated type, 155 mm. in length. 



Bathylagus atlanticus, Giinther. 



Giinther, 1878, Attn. Mag. Nat. Hist. (5), n, p. 248; 1887, Deep-sea Fish. 'Challenger', p. 219. 

 } Bathylagus atlanticus, Holt and Byrne, 1906, Fisheries, Ireland, Sci. Invest. 1905, 11, p. 6, pi. i, 

 figs- 3-4- 



Depth of body 4I in the length, length of head a little more than 4. Diameter of eye 

 2^ in length of head, interocular width 3^, interorbital width 5^. Dorsal 9; origin 

 nearer to end of snout than base of caudal. Anal 13 ; origin nearer to base of caudal than 

 insertion of pelvic, 3f times as distant from end of snout as from base of caudal; length 

 of base 7I in that of fish. Pelvics 8-rayed, inserted below last ray of dorsal. About 36 

 scales in a longitudinal series. 



Described from a single specimen, 160 mm. in length, type of the species. 



Hab. Atlantic. 



The specimens described by Holt and Byrne, the largest of which is 54 mm. in 

 length, were taken off the coast of County Mayo, Western Ireland. I have been unable 

 to re-examine these examples, but, through the courtesy of Mr G. P. Farran of the 

 Department of Fisheries, Dublin, I have had the opportunity of studying several more 

 small specimens taken off south-west Ireland subsequent to the publication of Holt and 

 Byrne's paper. Nearly all these are too young to be identified with any degree of cer- 

 tainty, but one, which is 50 mm. in length, may be the young of this species or of B. 

 benedicti. A brief description of this fish follows : 



Depth of body 5 1 in the length, length of head nearly 4. Diameter of eye about twice 

 in length of head, interocular width 3. Dorsal 10. Anal 16 (or 17); origin about equi- 

 distant from base of caudal and insertion of pelvic, 3^ times as distant from end of 

 snout as from base of caudal; length of base 6 in that of fish. 



One specimen, 50 mm., 50° 57' N, ii°38'W. Mesoplankton trawl at about 700 

 fathoms. 



Bathylagus microcephalus, n.sp. 



St. loi. 15. X.. 26. 33° 50' to 34° 13' S, 16° 04' to 15° 49' E. 4J m. net, horizontal, 850-950 m. : 

 I specimen, 129 mm. 4 J m. net, horizontal, 350-400 m. : i specimen, 172 mm. Holotype. 



St. 239. 2. vi. 27. 46° 56' 00" S, 46° 03' 00" W. 4I m. net, horizontal, 1050-1350 m. : 4 

 specimens, 38-84 mm.? 



