Interorbital width contained 2 to 3 times in width of distal portion of upper jaw 7 



Interorbital width very narrow, contained 5 to 7 times in width of distal portion of upper 



jaw 10 



SAO series angulate. SAOij interspace greater than that of SA02.,t; SAO.) usually well 

 above a line through SAO,..; SAO, over VO;,. AO 16 (15-17); 3 or 4 AO behind end of anal 



base P. (H.) thompsoni 



SAO series usually in an evenly spaced straight line; SAO, over or slightly before VO^. 



AO usually 12-14 (rarely more); 2 or 3 AO behind end of anal base 8 



Gill rakers 4 -H1-H2 (11-13), total 17(16-18) P.iH.) beckeri 



Gill rakers 4-5 -I- 1-f- 15-17, total 20-23 9 



Head and prepectoral lengths about 30-33% of SL. AO 13-14 (12-16); 2 or 3 AO behind 



end of anal base P. (H.) cracker 



Head length 37-38% of SL; prepectoral length 34-39% of 81. AO 13 (12-14); 2 (rarely 1 or 



3) AO behind end of anal base P. (H.) chilense 



Pre interspace equal to 1.0 to 1.5 photophore diameters. AO 14 (13-15), usually 3 AO 



behind end of anal base P. (H.) subparallelum 



10b. Pre interspace equal to 3 to 4 photophore diameters, about equal to AO-Prc interspace. 

 AO 17-19; 6 to 7 AO behind end of anal base P. (H.) parallelum 



6a. 

 6b. 



7a. 



7b. 



8a. 

 8b. 

 9a. 



9b. 



10a. 



Protomyctophum (Protomyctophum) anderssoni 



(Lonnberg, 1905) 



Fig. 2 — Protomyctophum (P.) anderssoni . female. 68.0 mm. From Andriashev ( 1962, p. 



227, fig. 6). 



Description 



D. 11-12; A. 18-19; P. 14-15; AO. 12-13; gill rakers 6-8 + 1 + 19-22, total 26-30; vertebrae 

 38(37-39). 



Two SAO (rarely 3) low on body, horizontal, over space between VO and AO series. Pre a 

 little less than a photophore diameter apart. VLO low, a little above and behind pelvic origin. 

 Four AO behind end of anal base. Greatest depth of body about 20% of SL. 



Supracaudal luminous glands of males with 5 to 7 rounded, deeply set scales (Fig. 3). 

 Infracaudal glands of females with to 3 to 5 weakly outlined spots. In either sex these glands do 

 not form until 30 mm or larger. 



14 



