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 serr^ 

 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 serrae towards the tip, which be- 

 come small tubercles towards base ; soft rays but little 

 longer than spine, which reaches slightl}^ beyond one-half 

 distance from its orig-in 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, ig% inches long, was taken by the 

 Hopkins expedition in the estuary at Mazatlan. It is 

 numbered 1575 in the collection of the Leland Stanford 

 Jr. Universi'ty. 



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). 



