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%; 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 latus, 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-1, 19; anal II-1, 
I5; eye 3% in head; pectoral 3% in length, equal to 
head; ventral 7%; dorsal lobe 54%; caudal 3%. 
Dorsal outline of body evenly curved trom snout to 
caudal peduncle; ventral outline straight from gill open- 
ings to anal spine, behind which it is curved like the dor- 
sal portion. 
