i6 5 



10. Myctophum pristilepis (Gilbert & Cramer). 



Myctophnin (Dasyscopehis} asperum Bleeker, Atl. Ichth. VI. livr. 27. 1875, p. 



159 (nee Richardson). 



Dasyscopelus pristilepis Gilbert & Cramer, Proc. U.S. Nat. Mus. XIX. 1897, p. 412. 

 Dasyscopelus pristilepis Gilbert, Bull. U.S. Fish. Comm. XXIII, 2. 1903 (1905), 



p. 600. 

 Myctophum pristilepis Gilbert, Bull. Mus. Comp. Zool. Harvard Coll. XLVI. 



1906, p. 259. 

 Myctophum pristilepis Max Weber, Siboga-Exp. Fische, 1913, p. 88, 669. 



Fig. 64. Myctophum pristilepis (Gilb. & Cram.) and a ventral scale. 



D. 1213; A - l8 ; P- 20; V. 8; L.I. 3538. 



Height 4'/ 2 > head 3*/ 2 , eye 2 3 / 5 ; snout bluntly rounded, very 

 short, less than ! / 3 of eye, its tip nearly on a level with lower 

 border of pupil. Interorbital space nearly flat. Mouth very 

 oblique. Upper jaw reaching to vertical through posterior 

 margin of eye. Origin of dorsal before middle of body, above 

 or slightly behind origin of ventrals, ending before origin of 

 anal. Adipose fin opposite to posterior part of anal. Caudal 

 forked. Scales large, firm, ctenoid, their edges with rather 

 stout teeth, absent or obsolescent on the scales of the lateral 

 line, which are vertically enlarged. Large scales on opercles 

 and cheeks. Luminous organs : an antorbital at the ventral 

 part of the frontal margin of the orbit, a dorsal one only 

 evident in the young (Gilbert). Two operculars, a larger dorsal one 

 slightly below the level of the inferior margin of the eye, 

 the much smaller ventral one behind the angle of the upper jaw. 

 3 branchiostegal organs ; 5 nearly equidistant PO, the fifth out- 

 side and somewhat upward of the series between isthmus and 

 ventral. Posterior PVO immediately before lower base of pec- 

 toral, the anterior obliquely before and below it, above the 



