JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSIiy, TOKYO, 

 VOL. XXVII., ARTICLE 15. 



Some Observations on the Luminous 

 Organs of Fishes. 



By 



Hiroshi Ohshima, RigalmsM. 



Zoological Institute, Imperial University, Tokyo. 



With 4 textßgiircs and 1 plate. 



The present paper contains a condensed account of my 

 observations on the luminous organs of the following species of 

 fishes made during the years 1908-9 : Etmopierus lucifer, E. 

 frontimacukUiis, Maurolicus pennanti, Myctophum affine, 31. 

 spinosum, 31. laternatum, 31. tvatasei and 31. splendidum. The 

 work was concluded before the publication of Prof. Brauer's 

 comprehensive and excellent work on the same subject, which 

 has made a detailed treatment on my part unnecessary. It is 

 a pleasure to me to express at the outset my hearty thanks to 

 Prof. Ijima, Prof. Watase, Prof. Goto, Mr. Moriwaki and 

 Mr. Tanaka, who have helped me in various ways, and par- 

 ticularly to Prof. Watase at whose suggestion the work was 

 undertaken. 



I. Luminous Organs of Spinacidae. 



In the family of Spinacidœ, I studied two species of the 

 genus Etmopterus, namely E. lucifer Jordan and Snyder and 

 E. frontimaculatus Pietschmann. They are very nearly allied 



