18 ART. 15. H. OHSHIMA : SOME OBSERVATIONS 



organs of tlie Myctophidœ and those of other families. The 

 principal of them lie in the thinly lamellar structure of the 

 photogenic body and in the fact that the organs are distinctly 

 innervated. 



Even in sections stained by ordinary means, one can find 

 with ease the nerves entering the organ as were already de- 

 scribed by Leydig, Emery, Gatti etc. I was fortunate enough 

 to succeed with the silver impregnation method of Cajal. 



In the orbital organs the nerves enter usually in company 

 with blood vessels. They penetrate the reflector vertically, then 

 to run with their main part directly to the periphery of the 

 organ, sending out in their course small branches between the 

 photogenic cells (PI. I, fig. 9, n). 



In some sections through one of the anterior anal organs of 

 M. watasei, small nerves were found breaking up into fascicles 

 and running distad, parallel to the lamellar gland-cells (figs. 10 

 and 11, n). 



As to blood supply, one can always find in every luminous 

 organ a plenty of capillaries forming a plexus around the pho- 

 togenic bodies (v). 



Luminescence, 



I have observed a number of living fishes belonging to the 

 present family, together with the above mentioned MauroUcus, 

 in Saga mi Sea. 



The most brilliant light was produced from the anteorbital 

 organs and the luminous scales, the former throwing the rays 

 rostrad and ventrad just like the head-light of an automobile. I 

 have unintentionally omitted to pay attention to the mediocaudal 

 photophores (" Leuchtplatten " of Brauer), which were subse- 



