22a. AOa series in a slighly arched line; AOai.^ interspace wider than others of the series. 



VLO no higher than midway between pelvic base and lateral line. VLO, SAO,, and SAO^ 

 in nearly straight, horizontal line. Pectoral fin short, reaching to about pelvic base; width 

 of pectoral base 287? (24-31'7f ) of length of orbit. Two photophores on cheek. Secondary 

 photophores well developed. 7 (8-9) luminous scales in infracaudal gland L. iselinoides 



22b. VLO above level of SAO, 23 



23a. Width of pectoral base 55'7r (50-60'7f ) of length of orbit. Pectoral fin reaching to between 

 A0a2 and AOa.v SAO, above level of SAOj, the 2 usually forming straight line with VLO. 

 A0a2, and often AOa.i, usually depressed below level of adjacent AOa. Two, rarely 1, 

 cheek photophore. Body photophores not unusually small; secondary photophores weakly 

 developed, persistent only near lateral line L. intricarius 



23b. Width of pectoral base 39% (35-42%) of length of orbit. Pectoral fin reaching to between 

 VO2 and VO.i. SAO, below level of SAO^, line through them passing far below VLO. A0a2 

 and A0a3 occasionally depressed below level of adjacent AOa. One, rarely 2, cheek 

 photophores. Body photophores very small; secondary photophores well developed, per- 

 sistent over entire body L. lepidolychnus 



Lampanyctus ritteri 



Gilbert, 1915 



Fig. 157 — Lampanyctus ntten. male, 108.0 mm. 



Description 



D.13 (13-15); A. 18 (17-19); P. 11 (11-12); AO 7 (6-8) -i- 8 (9), total 15 (14-17); gill rakers 4 + 

 1 + 9 (8-10), total 14 (13-15); vertebrae 36 (35-38). 



Body moderately robust, its depth at pelvic origin about 18% of SL; caudal peduncle deep, 

 about 10% of SL. Infracaudal luminous gland covering no more than three-fourths (usually 

 less) of the ventral surface of the caudal peduncle. VO; not elevated. VLO on line through 

 SAO, and SAO2 and a little below midway between lateral line and pelvic base. SAO.j well 

 behind from anal origin. Prcj slightly behind vertical from Prcg. 



Size: To about 120 mm. 



Least depth of capture: To about 20 m at night. 



Distribution: Apparently confined to colder waters of the northeastern Pacific (Fig. 158). It 

 ranges from about 25° N off Baja, California, Mexico, to about 46° N off Vancouver Island, 

 Canada. Aron (1960) reported captures as far west as about 146° W. Solitary captures of what 



170 



