146 CALIFORNIA ACADEMY OF SCIENCES. 



Gill-rakers united, joined to the isthmus. Gill-rakers 

 8 + 14. 



Pectoral pore moderate. 



Distance of dorsal spine from snout 2| in the length, the 

 spine 1^ in head, serrate on its posterior margin, granulate 

 in front along basal half, becoming nearly smooth above. 



Space between dorsal and adipose fins 3^ in the length, 

 the adipose shorter than the dorsal fin, free posteriorly. 



Caudal forked, 4| in the length. 



Anal fin a little longer than high, its highest rays about 

 half length of head. 



Ventral fins about 2 in the head. 



Pectoral spine as long as the dorsal spine, but stronger, 

 serrate on its inner margin, granular along its outer 

 margin. 



Dorsal surface brown; sides and ventral surface silvery; 

 fins smutty. 



Head SJ; depth 5; D. I, 6; A. 19. 



122. Tachisurus fissus (Cuv. & Val.) 



? Arius puncticulaius Cuv. & Val. 



123. Tachisurus melanopus (Giiuther.) 



124. Tachisurus spixii (Agassiz.) 



Pimelochifi albidus Spix ; Arius a<-inatus Cuv. & Val.; Arius laticeps 



Giiuther. 

 Localities: Maranhao; Bahia; Kio Jaueiro; Para; Santos in Sao 



Paulo; Abrolhos. 



125. Tachisurus fiirthii (Steiuda-huer.) 



Locality: Panama. 



126. Tachisurus variolosus (Cuv. &Val.) 



127. Tachisurus multiradiatus (Giiuther.) 



Bagriis / ca'ioides Kner (not B. arioides C. & V.) 



§ CatJiorops. 



128. Tachisurus hypophthalmus (Steindachner ) 



129. Tachisurus gulosus sp. uov. 



Two specimens, (^ ; leugth .285 — .29 m. Panama. Steindachner. 



