30 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 76 



what above the level of the upper PVO.^^ VLO in contact with the 

 lateral line. 5 VO. 3 SAO, the lower slightly in advance of the 

 fifth VO and of the line through second and third SAO. Second 

 SAO much closer to the lower SAO than to the upper, which is in 

 contact with the lateral line. First AO anterior sharply elevated, 

 last AO anterior also very conspicuously above the level of the rest 

 of the series. AO 7 + Q. 4 Pre, the last organ slightly below the 

 end of the lateral line. 



The original illustration (Gilbert and Cramer, 1897, pi. 38, fig. 1) 

 being inadequate for showing the accurate arrangement of the photo- 

 phores, the accompanying diagram (fig. 14) was prepared from the 

 type specimen. 



Two specimens have a very conspicuous median dorsal luminous 

 area on the caudal peduncle, occupying the greater part of the dis- 

 tance between the caudal and the adipose dorsal fin. 



Known only from Hawaiian waters. 



Figure 14. — Diaphus ueolampus Gilbert and Cramer 



DIAPHUS AGASSIZI Gilbert, 1908 



Diaphus agasslzii Gilbert, 1908 and 1913; Pabr, 1928; Fowler, 1928. 

 Myctophum (Diaphus) lacerta (part) ? Beaueb, 1906. 



Material investigated. Type specimen No. 75764, U.S.N.M. From 

 the Marquesas Islands. 



The original description and figure (Gilbert, 1908, p. 226 and pi. 

 2), together with the remarks upon some of its features subsequently 

 added by the same author (Gilbert, 1913, p. 85) give a very adequate 

 and accurate conception of the characters of this species, making fur- 

 ther comment unnecessary. 



The species is distinct from D. dimierili Bleeker by the absence of 

 a suborbital organ and by the elevation of the first AO anterior, and 

 from D. urolampus Gilbert and Cramer by having the VLO situated 

 only " very slightly nearer lateral line than base of ventrals." 



Properly defined in the i^reviously rendered key (Parr, 1928, 

 Division II A 1, p. 115). 



Known from the Marquesas Islands and from Japan. 



*This character can not be considered very reliable except in perfect specimens. 



