24 FISHES OF SINALOA. 399 
line of the vomer; form of vomerine bands similar to 
that of the palatine bands but smaller. Palatine band of 
teeth without backward prolongations. 
Opercle with radiating ridges; humeral process gran- 
-ular, triangular, lower posterior corner prominent; axil- 
lary pore very small. Gill membranes forming a broad 
fold across isthmus. 
Dorsal fin short, base not including spine equal to base 
of adipose dorsal; dorsal spine robust, but little shorter 
than pectoral spine, about two in head; its anterior serre 
small and tubercle-like; its posterior edge, as well as that 
of pectoral, retrosely serrate; soft rays of dorsal extend- 
ing but little beyond spine, the longest about three - fifths 
length of head. Adipose dorsal about one-half as high 
as long. Caudal lobes unequal, the upper lobe about 
one-third longer than lower lobe. Anal short, of medium 
height. Distance from vent to base of ventrals one-half 
distance from origin of anal. Pectoral spine very strong, 
its anterior margin with serre towards the tip, which be- 
come small tubercles towards base; soft rays but little 
longer than spine, which reaches slightly beyond one-half 
distance from its origin to base of ventrals. 
Color dark blue with silvery reflections on sides; belly 
pale, mental barbels dusky: maxillary barbels light below 
and black above; paired fins darkest on inner side; other 
fins almost uniformly dusky. 
One specimen, 19% inches long, was taken by the 
Hopkins expedition in the estuary at Mazatlan. It is 
numbered 1575 in the collection of the Leland Stanford 
alee University. 
27. Galeichthys guatemalensis (Giinther). 
Taken by Dr. Gilbert at Mazatlan; not seen by us. 
Also recorded from Chiapam (Giinther), and the coast of 
Colima (Xantus). 
