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Adaptations of Fishes 



entiated areas round or oblong which shine star-like in the 

 dark. These are usually symmetrically placed on the sides of 



FIG. 142. Headlight Fish, ^Ihoprora lucida Goode and Bean. Gulf Stream. 



the body. They may have also luminous glands or diffuse areas 

 which are luminous, but which do not show the specialized 

 structure of the phosphorescent spots. These glands of similar 

 nature to the spots are mostly on the head or tail. In one 



FIG. 143. Corj/nolophus reinhardti (Liitken), showing luminous bulb (modified 

 after Liitken). Family Ceratiidce. Deep sea off Greenland. 



genus, Mthoprora, the luminous snout is compared to the head- 

 light of an engine. 



