106 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 

 Genus VINCIGUERRIA Jordan and Evermann, 1896 



Body oblong to elongate, fairly compressed; head compressed, its 

 bones thin, but ossified; mouth large; maxillary extending beyond 

 posterior margin of eye; teeth in a single series on margins of both 

 jaws, on palatines and sometimes on vomer; gill rakers well developed; 

 lower part of body anteriorly with two rows of photophores, the upper 

 row ending at or near origin of anal, the lower row almost continuous 

 from isthmus to base of caudal; each organ pearllike, and set in a 

 black socket, directed more or less downward; scales present in at 

 least one species; dorsal on posterior half of body; anal short, with 

 about 14 or 15 rays; color chiefly bright silvery. 



One species, which appears to be new, is included in the Peruvian 

 collections that were examined. The members of the genus have not 

 been studied thoroughly, and their relationship remains obscure. 

 Few specimens even now are available for study, and it has been 

 necessary to rely chiefly on rather inadequate descriptions. 



VINCIGUERRIA PACIFICI, new species 



Figure 23 



Head 3.7 to 4.0; depth 6.5 to 7.2; D. 13 or 14; A. 15; V. 7; P. 9 or 10; 

 vertebrae 41 (one specimen dissected). 



Body quite elongate, compressed, its greatest thickness slightly 

 exceeding half its depth; caudal peduncle moderately slender, 5.0 to 

 5.7 in head; head rather long, compressed, its depth at margin of 

 preopercle 1.7 to 1.8 in its length; snout pointed, bent upward at tip, 

 4.33 to 4.8 in head; eye 3.5 to 4.2; interorbital slightly concave, with 

 a narrow shelf like projection over eye, and low ridges and grooves 

 extending forward on snout, 5.9 to 7.0 in head; mouth large; lower jaw 

 projecting rather strongly, pointed, not extending into dorsal profile; 

 maxillaries forming rim of upper jaw posterior to region of nostrils, 

 broadly curved, extending well beyond posterior margin of eye, 1.5 to 

 1.6 in head; teeth small, pointed, in a single series on margin of maxil- 

 laries and premaxillaries, and in a single series laterally on lower jaw, 

 1 tooth on each side on vomer, and a row of about 5 on each palatine; 

 opercle with a prominent angle at beginning of upper series of photo- 

 phores, and an indentation at the lower series; gill rakers well de- 

 veloped, those at angle about two-thirds diameter of eye, 21 to 23 on 

 lower and 9 to 11 on upper limb of first arch; lateral line apparently 

 undeveloped; 2 rows of photophores present on lower part of side, the 

 upper one beginning above base of pectoral and extending to origin of 

 anal, with 1 1 organs in advance of ventral and 1 1 behind it ; lower row 

 beginning on isthmus, and extending to base of caudal with a slight 

 interruption at origin of anal, 7 organs on isthmus, 14 from isthmus to 

 ventral, 10 from ventral to origin of anal and 14 from origin of anal 

 to base of caudal; 2 on opercle in advance of upper row, 1 at lower 



