59 FISHES OF SINALOA. 431 



Another example was, in life, blue above, silvery be- 

 low; no dark spots on opercle or pectoral: pectoral 

 bright yellow, very long. D. and A. and C. lobes, all 

 tipped with black. Base of dorsal bright blue. Anal and 

 dorsal largely blue. Base of caudal peduncle green 

 above. No trace of bands: a slight dusky shade on axil. 



The very young, taken from the body of a Medusa, 

 may be thus described : 



Head 3 in length: depth 2-f-; dorsal IX. 24: anal 

 II, I, 18 or 19: ventral with a sheath: scales minute: 

 caudal keel scarcely appreciable: lower jaw projecting; 

 mouth oblique ; body deep, compressed ; caudal peduncle 

 slender, the fin short, moderately forked; pectoral short, 

 not falcate, shorter than head; maxillary broad, reaching 

 pupil; preorbital narrow; dorsal and anal not falcate; 

 lateral line arched before, then straight: jaws with teeth; 

 preopercle with flexible spines. 



Clear white, fins all pale, a bright violet blue area above 

 and behind eye, fading in spirits : dark dots above ; dorsals 

 both dusky at tip. 



85. Caranx marginatus (Gill). 



Not rare in the Astillero, where several specimens were 

 taken by us. This species is well distinguished from 

 Caranx lat us, with which it has hitherto been confounded, 

 since it was originally described by Dr. Gill. The follow- 

 ing are its characters : 



Head 3^ ; depth 2%; dorsal VIII-i, 19; anal II-i, 

 !5; eye 3 2 A m head; pectoral 3^ in length, equal to 

 head; ventral 7^ ; dorsal lobe $% ; caudal 3^. 



Dorsal outline of body evenly curved from snout to 

 caudal peduncle ; ventral outline straight from gill open- 

 ings to anal spine, behind which it is curved like the dor- 

 sal portion. 



