Fig. 127 — Diaphus brachycephalus. male, 51.2 mm. (Photophores retouched). 



SAO..-,!. Pre closely spaced in a moderate curve, the Prc.^.^ interspace a little wider than the 

 others. Opercular margin irregular, the lateral portion produced into a blunt point above FLO. 



Size: To about 45 mm. 



Least depth of capture: To about 150 m at night. 



Distribution: Apparently the species is confined to warm waters of both the North Atlantic 

 and Pacific Oceans (Fig. 124). I have seen two specimens from the South Atlantic Ocean (33° 

 47' S, 15° 47' W). 

 Discussion 



The 10 specimens before me answer well to the description and figure offered by Nafpak- 

 titis (1968) for specimens from the North Atlantic (the type locality). This species is closely 

 related to D. richardsoni but differs slightly in some body proportions (Table 25) as well as in 

 certain luminous organs, as stated above. 



Table 25. Body Proportions for Diaphus richardsoni and D. brachycephalus. 



'Data from Nafpaktitis (1968). 



142 



