FISHES OF WEST COAST OF PERU. 57 



d\ Dorsal and anal eacb with a single detached finlet; body slender. 



Decapterus, p. 58. 



d". Dorsal and anal without finlets. 



e\ Lateral line with well-developed scutes for its entire length ; body 



elongate . Trachurus, p. 59. 



e^ Lateral line with scutes on its straight posterior portion only (these 



sometimes very few and small, especially in those species with the 



body much compi*essed ) . 



f. Body oblong or more or less elevated, not as below; teeth of jaws 



in few series, or in one series, unequal, or at least not forming 



villiform bands, outer series above usually enlarged, lower teeth 



usually uniserial ; vomer and palatines with teeth ; maxillary 



broad Caranx, p. 61. 



f. Body broad-ovate, very strongly compressed, its outlines every- 

 where trenchant, anterior profile nearly vertical, scutes almost 



obsolete Vomer, p. 62. 



fc^ Lateral line without any scutes; body short and elevated, strongly 

 compressed Selene, p. 62. 



Genus NEPTOMENUS Gunther. 



82. NEPTOMENUS CRASSUS Starki. 

 COJINOBA; COJINOBITA. 



Neptomemis crassus Starks, Fishes from Ecuador and Peru. Proc. U. S. 

 Nat. Mus., vol. 30, 1906, p. 784, fig. 8 ; Callao, Peru. 



Three specimens, field Nos. 09660, 09662, and 09664, respectively, 

 20.8, 23, and 26 cm. in length, from Callao, and two specimens, field 

 Nos. 543-4, 18.5 and 16.8 cm. in length, from MoUendo. 



Head 2.75 to 3.3 in length; depth 3 to 3.3; eye 4 to 5 in head; 

 snout 3.55 to 3.85 ; maxillary 3 to 3.25 ; interorbital 3 to 3.25 ; pectoral 

 1 to 1.15; D. VII, 1, 25-7'; A. II, 18-21; scales small, about 15-85 

 to 90-33. 



Measurements of an individual 26 cm. in length from Callao : head 

 2.96 in length; depth 3.1; eye 4.75 in head; snout 3.73", maxillary 

 3.22; interorbital 3.03; pectoral 1; D. VII, 1, 27; A. II, 27; scales 

 15-85-33, pores 90. 



Body short, rather deep, compressed, ventral outline more strongly 

 arched than dorsal, base of anal oblique, caudal peduncle slender, its 

 depth equal to diameter of eye; head large; snout blunt, broadly 

 rounded; interorbital broad, convex, 1.5 times horizontal diameter 

 of eye ; eye large, center of eye on level with tip of upper jaw ; mouth 

 moderate, oblique ; maxillary reaching nearly to the vertical from the 

 anterior border of the pupil; maxillary not protractile, skin of tip 

 of snout continuous with that of upper lip ; teeth five, villiform, in a 

 single row in each jaw; no teeth on vomer or palatines, jaws sub- 

 equal ; nostrils small, close together, nearer tip of snout than anterior 

 margin of eye; preorbital very narrow, one-half diameter of pupil; 



