The distribution of photophores corresponds basically to the type (No. 

 27745 Zool. Inst. Akad. Nauk SSSR). The abbreviated photophore terminology 

 is that of Parri^ and is indicated by figure 1 . The photophores are small, 

 circular without horizontal division . One PLO about middle between the pectoral 

 fin and lateral line (not closer to pectoral as stated in the description of the 

 type) . Two PVO are placed over each other over the base of tJie pectoral . Pec - 

 toral photophores (PO) number five. The anteriormost is separated from the 

 series by twice the normal interval. PO4 is elevated to the level of the pec- 

 toral fin. There are four ventral photophores (VO). Between the interval 

 separating VO^, and VO2, between this series and the lateral line is the super 

 ventral VLO. Three SAO m an oblique row, the last not reaching the LI but 

 separated from it by a space its own diameter, and from SAO2 by the space 

 equal to the distance between the first and second VO. Anal photophores (AO) . 

 in two series, anterior (Ant. AO) 6-7, posterior (Post AO) -8; both series in 

 line. Over the space between the two series is a single PLO, placed under the 

 LI at a distance equal to its diameter. Precaudal photophores (Pre) 4. The 

 two first a continuation of the AO, the last two forming an arc which ends 

 under the end of the lateral line . In all, a total of 35 photophores . 



Caudal peduncle with dorsal and ana] luminous scales (Lsc). The better 

 preserved example (98 mm TL) has 6 7 super Lsc and 7-9 Inf Lsc, Two small 

 photophores on preopercular . Preorbital organ (Pr . O) is inervated by a few 

 slightly reduced rami from the N. olfactoruis, but obviously serves as a 

 light organ. 



Dorsal high, originating on a vertical behind the ventral . Dorsal base 

 almost as long as anal base 14.8-19.3%. The longest ray is the 6th. First two 

 rays stiff in young but in adult only the first is short and spine -like. The 

 posterior end of the dorsal terminates on a line with the 6-7 anal ray. Base 

 of the anal fin 16.7-19.8%, first ray low and stiff. Longest ray is the 

 3rd and 4th . Ventral fm well developed, not quite reaching anus, its length 

 9.1-11.1%. Pectoral reduced, one half diameter of eye . The caudal rays long 

 but not divided and become shorter anteriorly. (C. Sp.). Upper Cap 6-7, lower 7-8. 



Remaining scales dark brown. Dorsal portion of opercular, gill membranes, 

 gills and lining of mouth and peritoneum are all black . Fins are dark. Stan- 

 dard length 44-88 mm. 



1/ 



Parr, Notes on the species of myctophine fishes . . . Proc. U. S. Nat. 

 Mus. vol. 76, 1929, art. 10, p. 2, fig. 1. 



10 



