SAOs, Pol, and Prc4, respectively, two to three of their diameters below lateral line. VO2.3 

 interspace 48% (39-55% ) of the space between VLO and VO2. SAO series angulate, a line 

 through SAO1.2 usually passing through V0.-„ occasionally before, but well behind SAO3. AOa, 

 from 1.0 to 1.5 diameters above level of AOaj, the succeeding AOa in a straight line ascending 

 dorsally at a slight angle; last AOa nearly its diameter above next to last. Pol about its 

 diameter before a vertical from end of base of adipose fin. Pre interspaces progressively wider. 



Luminous scale at PLO large, broadly lunate, its length greater than distance from PLO 

 to pectoral origin, the luminous tissue in more or less straight lines that slant posteroventrally 

 at a steep angle, often vertically. Vn of males large, undivided, filling space between postero- 

 ventral margin of orbit, premaxillary and nasal apparatus; an intrusion of non-luminous 

 tissue extends ventrally from orbital rim at about mid-Vn so that the organ may appear 

 divided. Vn of females much smaller and broadly ovate. 



Teeth of both jaws similar to those of Forms A, B, and C. Palatines toothless except for 1 or 

 2 occasional small teeth at anterior end. Mesopterygoids sparsely set with small, conical teeth, 

 the centers often toothless. 



Size: To 38 mm. Form D also appears to be a small species; gravid females were found at 

 lengths of 28 and 32 mm. 



Least depth of capture: To 50 m at night. 



Distribution: Form D is known only from the tropical eastern Pacific (Fig. 119). 



Diaphus rafinesquii species complex in the 

 North Pacific Ocean 



Form R-l 



Form R-2 



Form R -3 



Fig. 121 — Forms R-l, R-2, and R-3 of the Diaphus rafinesquii species complex in the North 



Pacific Ocean. 



134 



