28 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.76 



As a very adequate and generally accurate figure and description 

 of the species has already previously been rendered by Brauer 1906 

 (p. 246), we can here confine ourselves to a few notes on minor 

 differences observed in the above recorded type and paratype. 



The upper organ on the cheeks is in both specimens slightly, but 

 distinctly nearer to the posterior margin of the orbit than to the 

 praeopercular margin. The posterior margin of the lower Pol 

 barely touches the line through the centers of the upper Pol and 

 the last AO anterior, these three organs thus not forming an en- 

 tirely straight series, but only nearly so. The type specimen has 

 6 + 7 AO, well separated from the four Pre. In the paratype 6 + 8 

 AO are found, the AO posteriores being confluent with the 4 Pre. 

 The latter organs are, however, also in this case readily distinguish- 

 able from the AO posteriores by their slightly smaller size and closer 

 arrangement. Third Pre only very slightly, barely noticeably, below 

 the line from the second to the fourth Pre. Interspace between third 

 and fourth Pre increased. The above recorded numbers of AO 

 differ from those given by Brauer on account of the fact that only 

 the two most posterior Pre as here understood were counted as 

 praecaudals by the said author. 



Recorded only from the Atlantic. 



Named in honor of A. Vedel Taaning in recognition of his valu- 

 able contributions to our knowledge of the biology and taxonomy 

 of the Myctophinae. 



DIAPHUS UROLAMPUS Gilbert and Cramer, 1897 



Myctophum (Diaphus) urolampiis Brauer, 1906. 

 Diaphus urolampiis Jordan and Jordan, 1922; Parr, 1928. 



Material investigated. Type specimens No. 47709, U.S.N.M. 

 (3 specimens). 



An inspection of the type-specimens did not serve to confirm the 

 statement rendered by Gilbert (1908, p. 227, under discussion of 

 D. agassizi)., that the upper antorbitals are "apparently no longer 

 functional," but on the contrary revealed the organs in question 

 as being, at least macroscopically, apparently perfectly equivalent 

 with the presumably functional upper antorbitals of such species as 

 D. dinnerili Bleeker, D. hypolueens Parr and others. Each of the 

 upper antorbitals in D. urolampiis has a small, but very distinct body 

 of whitish, supposedly luminous tissue imbedded in densely pig- 

 mented black tissues. There are no lower antorbitals, and no supra- 

 or suborbital organs. The species thus properly belongs in divi- 

 sion II A 1 in the key previously rendered by the author (Parr, 1928, 



