THE SHORE FISHES OF PERU 117 



MYCTOPHUM TENICULUM Carman 



Myctophum teniculuvi Garman, 1899, p. 262, pi. J, fig. 5, lat. 6°21' N., long. 



80°41' W. (about 75 miles south of the Province of Las Santos, Panama), 



surface (original description). 

 Myctophum coccoi Parr (probably in part not of Cocco), 1928, p. 61 (diagnosis 



in key; synonymy; note; range). 



Head 4.0; depth 4.0; D. 11; A. 19; V. 7; P. 13; scales 41. 



Body anteriorly deep, compressed, its greatest thickness only about 

 two-fifths its depth, tapering strongly over base of anal; peduncle 

 very long and slender, 5.25 in head; head short, deep, compressed; 

 snout short, bluntly pointed, 7.7 in head; eye 3.6; interorbital convex, 

 forming a narrow shelf over eyes, 3.4; mouth slightly inferior; lower 

 jaw included; maxillary very narrow, reaching well beyond posterior 

 rim of orbit, or nearly to margin of preopercle, 1.6 in head; teeth 

 minute, pointed, in a very narrow band on margin of premaxillaries, 

 and on margin of mandible, in a single series on vomer and palatines; 

 lateral hne nearly straight, complete; photophores in an almost 

 continuous row along ventral edge of trunk and tail, slightly inter- 

 rupted at base of ventral and origin of anal, the organs being a little 

 nearer the median ventral line between these points; 5 organs in 

 advance of ventral, 4 between ventral and anal, and 19 along base 

 of anal and ventral edge of peduncle, the last two separated from the 

 others by a somewhat longer interval; a median series of 5 large light 

 organs on peduncle behind anal ; a row of 3 organs on branchiostegals ; 

 1 behind margin of preopercle, somewhat above maxillary; 1 median 

 one on interorbital; 3 on shoulder girdle, 1 above and 1 below base of 

 pectoral, and 1 still lower and partly under opercle; 2 above ventral 

 fin, on third row of scales below lateral line; 1 above and a little in 

 advance of vent, between second and third rows of scales below 

 lateral line; 2 on first row of scales below lateral line, the first over 

 third anal ray and the second over the eleventh ray; scales along 

 lateral line much enlarged, 3 complete rows between lateral line and 

 first ray of dorsal, extending on dorsal, caudal, and anal fins; dorsal 

 rather small, the longest rays about as long as postorbital part of 

 head, its origin well in advance of midlength, its distance from snout 

 2.3 in length; adipose well developed, over posterior part of anal; 

 caudal damaged, forked according to Garman (see reference above); 

 anal somewhat elevated anteriorly, its origin a little behind middle 

 of dorsal; and equidistant from tip of snout and base of caudal, its 

 base 4.0 in length; ventral inserted about an eye's diameter behind 

 pectoral, and equidistant from posterior end of maxOlary and origin 

 of anal; pectoral somewhat below middle of side, near margin of 

 opercle, damaged, its length certainly greater than half length of head. 



Color dusky brown above; silvery gray to brownish on side and 

 below; opercle and first row of scales anteriorly above lateral Hne 



624264—45 -9 



