from Sobniow have therefore been identified as Eomyctophum cf. 

 koraensis Danil. 



The pectoral fins occur just a little lower than at middistance be- 

 tween the ventral margin and the backbone. The longest rays may reach 

 beyond the base of the rays of the ventral fins. 



The ventral fins may occur either below the 20-th — 22nd vertebra 

 (from the end) — that is below the first rays of the dorsal fin, when 

 the preventral area is equal to the predorsal or they may be shifted 

 further back. The preventral area represents on 20 specimens 48 — 51 

 percent of the body length without the caudal fin, on 19 specimens 

 52 — 58 percent, on 2 specimens, 46 — 47 percent, and on 1 specimen 62 

 percent. 



The dorsal fin consists of 11 — 12 rays. The predorsal area represents 

 45 — 50, 42 — 44 and 52 percent of the body length without the caudal 

 fin in 35, 6 and 1 specimens, respectively. In the Caucasian form — 

 48 percent. The first ray occurs above the 21st — 23rd vertebra (from 

 the end). 



The anal fin consists of 12 — 13 rays. Its beginning occurs below 

 the 13th — 15th vertebra (from the end) and is situated immediately 

 behind the last ray of the dorsal fin (Plate III, Fig. 2), or it may be 

 shifted by the distance of 1—2 vertebrae further back (Fig. 9). The 

 preanal area represents in 35 specimens 67 — 73 percent of the body 

 length without the caudal fin (70 percent in the Caucasian form), in 

 3 specimens it is 64 — 65 percent, and in 2 specimens 75 and 86 percent. 



The caudal fin is longer than in the preceding species; in some 

 individuals, it exceeds the length of the head. 



General remarks. The fundamental differences between the Sob- 

 niow remains and the Caucasian form of Eomyctophum koraensis con- 

 sist in the number of vertebrae (as already indicated), and in the marked 

 variability of such characters as the distance from the last ray of 

 the dorsal fin to the beginning of the anal fin; also, the position of the 

 ventral fins. In the Caucasian forms, the latter always occur below the 

 beginning of the dorsal fin. 



The descriptions given above reasonably suggest that in the Sob- 

 niow material the difference between E. menneri Danil. and. E. koraen- 

 sis Danil. is far less marked than might be supposed according to Da- 

 nilchenko (1947). This is particularly well shown by inspection of such 

 a feature as the distance from the last ray of the dorsal fin to the be- 

 ginning of the anal fin. In forms from the Caucasus this distance, ex- 

 pressed by the length of the precaudal vertebrae, is 1 — 1.5 vertebrae 

 in E. koraensis Danil., but 4 — 5 vertebrae in E. menneri Danil. In the 

 material from Sobniow, on the other hand, forms are encountered which 



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