Luminous Organs of Fish— Haneda 
227 
resemble ordinary non- luminous fish. This is 
because the luminous body lies inside the 
fish and cannot be seen from outside. 
These fishes differ from other luminous 
fishes by their unusually large luminous areas, 
which utilize as much as one half or one third 
of the muscles of the extremely complicated' 
body structure of the fish. 
The luminous fishes hitherto known are 
provided with a direct radiating luminous 
organ, while the fishes described in this paper 
possess an indirect radiating luminous organ. 
These organs of indirect emission are peculiar 
organs of a novel type, which appear to be 
confined to Acropoma species, the Leiogna- 
thidae, and Apogon marginatus Ddderlein. 
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