Y. HANEDA 



371 



In June, 1942, I saw schools of Anomalops at the surface of the 

 water in the harbor of Manukuwari on the northwest coast of New 

 Guinea. At that time I collected three small specimens and was able 

 to observe their luminescence. When this fish is swimming under 

 natural conditions, the luminous surface appears and disappears in- 

 termittently. If the fish is caught and put into a glass jar, its luminous 

 display becomes irregular, if the water is in any way unsuitable. A 

 fish in a dark place which is suddenly illuminated by switching on 



Fig. 10. A longitudinal section of the luminous organ of Anomalops. OP, open- 

 ing; EP, outer epithelium; P, pores; PHOT, luminous ducts; REEL, reflec- 

 tor; PG, pigment; ATR, artery. 



an electric light will cease to display luminosity in one or both organs. 

 In daylight the fish will not display its luminosity, but if the place 

 in which it is kept is suddenly darkened, its luminosity is immedi- 

 ately displayed and appears as a bluish green light. 



It was very remarkable that 4 specimens of this fish were obtained 

 near Japanese waters. The first specimen was caught in the sea near 

 Kominato, Chiba Pref., Japan, and was recorded by Abe (1942). The 

 second specimen was caught with hook and line near Kanminato Bay, 

 Hachijo Island, and was also reported by Abe (1951). The third and 



