writer in both species here considered; they are thus characteristic of 

 all the living Myctophidae. 



An analysis — as given above — of the arrangement and number 

 of luminous organs within the genus Eomyctophum Danil. reveals no 

 essential differences between these two species. Yet the importance 

 of the luminous organs — particularly of the anal group — as a spe- 

 cific character within the genus Myctophum is very strongly stressed 

 by Brauer (1906), when dealing with the systematics of the recent 

 Myctophidae. In Brauer's opinion, the number of the luminous organs 

 varies, but the range of variability may be correlated with particular 

 species (I. c. p. 159). Hence, the arrangement of the luminous organs 

 might indicate that — independently of other morphological differ- 

 ences — all the specimens are conspecific. This concept would also be 

 confirmed by the presence of forms displaying features which are 

 evidently transitional from Eomyctophum ynenneri Danil. to E. koraensis 

 Danil. The writer will return later to this subject. 



Eomyctophum m.enneri Danilchenko, 1947 



(Fig. 7) 



1947, Eomyctophum menneri Danil.; P. G. Danilchenko 



Ryby semeistva Myctophidae. p. 195, Fig. 2. 



Material. 48 skeletons, including 32 which are complete. Table 5 

 shows the dimensions of the six best preserved specimens, among which 

 No. 111. Os. is the smallest and 133. Os. the largest. 



Description. The maximum body depth is subject to strong 

 variations. Yet the predominant depth — in 25 specimens out of the 32 

 complete ones — represents 20 to 27 percent of the body length without 



Table 5 



Dimensions of E. menneri Danil. (in mm) 



Dimensions 



133. 



111. Os, 



17. Os. 



33. Os. 



51. Os. 



107. Os. 



Length of body without caudal fin 



Greatest depth of body 



Length of head to posterior margin 



operculum 

 Preorbital area 

 Horizontal diameter of orbit 

 Predorsal area 

 Preanal area 

 Preventral area 

 Length of caudal fin 



of 



37.3 

 9.0 



13.7 



17.3 

 28.4 

 21.7 

 11.5 



13.7 

 3.1 



5.1 

 2.6 

 1.2 

 6.7 

 10.4 

 8.0 

 4.5 



33.0 



7.4 



13.4 

 2.2 

 3.2 



24.7 

 19.3 

 10.2 



31.7 

 6.0 



11.2 



1.9 



2.8 



14.8 



22.6 



17.2 



8.2 



30.9 

 6.4 



11.1 



2.7 



2.3 



14.7 



23.3 



18.4 



ca.8.9 



25.9 

 5.5 



9.8 



2.4 



1.9 



11.9 



18.8 



14.8 



7.0 



29 



