Many individuals, however, indicate a manner of preservation of 

 photophores different from that just described — that is there is a sem- 

 blance of the occurrence of the photophores in double rows (Fig. 11), simi- 

 larly, as in the living Gonostomidae or in the genus Neoscopelus Johnson 

 of the Myctophidae. However, among the numerous specimens whose 

 photophores are thus arranged, forms have been encountered which 

 suggest that we are dealing here merely with a different manner of 

 preservation of an arrangement pattern which is typical of the genus 

 Eomyctophum Danil. One row might represent traces of luminous organs 



Fig. 10. Eomyctophum cf. koraensis 

 Danil. luminous organs ( after spec- 

 imen 101 Os.), ca X 10. 



Fig. 11. Eomyctophum, cf. koraensis 

 Danil. luminous organs (after spec- 

 imen 101 Os.), ca X 10. 



of the right side, the other those of the left side of the body. This 

 interpretation seems the most probable, although it has not as yet 

 been possible to clear up why on some specimens these organs are 

 preserved as traces occurring on one side only, while on others they 

 are present as pigment stains on both sides of the body. Note that the 

 one-row and the two-row arrangement of the luminous organs has been 

 encountered by the writer in her material in both species of the genus 

 Eomyctophum Danil. described below. 



Figure 9 shows a typical arrangement of the photophores. From 

 1 — 2 precaudal (pre.) organs occur close together, quite near the base 

 of the caudal fin; the organs of the anal row (AO) follow at a short 

 distance, (usually below the 4th or 5th vertebra from the back). The 

 latter form one continuous row which terminates above the first rays 

 of the anal fin. The last organs of the anal row, which occur beyond 

 the fin — usually 4, occasionally 3 in number — are marked AO pos- 

 terior, the remainder as AO anterior. These latter always consist of 

 5 — 6 photophores, arranged on about the same level, and of 3 (occa- 

 sionally 2) photophores placed slightly higher than the remainder. The 

 supraanal (SAO) photophores do not occur at all. This arrangement of 



4* 



27 



