26 



PROCEEDINGS OF THE NATIONAL. MUSEUM 



VOL. 76 



Pectoral fins long, reaching to or beyond the origin of anal 

 fin. 



Minute luminous organs scattered over the head and body. A 

 moderate, but conspicuous, photophore in the middle of each cheek. 

 PLO close to the lateral line. 2 PYO in a slightly oblique series, the 

 upper a little anterior to the lower. 5 PO^ the fourth elevated ap- 

 proximately to the level of the lower end of the base of pectoral fin. 

 YLO lost in the types, close to the lateral line according to Brauer 

 1906 and Taaning 1928. 4 V0\ all on the same level. 8A0 angulate. 

 Anterior SAO above the interspace between second and third YO^ 

 slightly but distinctly higher than second SAO. Second &A0 well 

 behind vertical from the last F<9, which is situated entirely in ad- 

 vance of the line through second and third SAO. Upper (third) 

 SAO at the lateral line. Second SAO approximately equidistant 

 from third SAO and fourth YO. ^(97 + 6, none elevated. The 



Figure 12. — Lampanyctus alatus Goodb and Bean. Only a few of the mindth 

 accessory photophorbs have been drawn to show their relative propor- 

 TIONS 



postero-anal series begins well behind the base of anal and is 

 posteriorly confluent with the 4 Pre, which are differentiable, how- 

 ever, by their smaller size and the shorter intervals between the 

 first and second and between the second and third organs. Inter- 

 space between third and fourth Pre greatly increased. Fourth Pro 

 immediately below the lateral line, somewhat in advance of the 

 vertical from the third Pre. 2 Pol., in a straight, oblique series with 

 the last antero-anal photophore, and with the upper organ imme- 

 diately below the lateral line, well behind the vertical from the 

 lower. 



Four supra- and four infra-caudal luminous scales, the latter occu- 

 pying a somewhat greater portion (about two-fifths) of the length 

 of the free caudal peduncle than do the former. A luminous scale, 

 or pair of scales in the adipose fin. 



The species has been recorded from the Atlantic and Indian 

 oceans. 



