90 CALIFORNIA ACADEMY OF SCIENCES. 



mandible, villiform; the inner series of the ciiz::;;;^^ 

 mandible and the palate with granular teeth; .^ n 

 the palatine patches of teeth small, subovate, /y \^ 

 sometimes contiguous in front. ^'■^• 



Gill-membranes united, joined to the isthmus, not 

 forming a free margin across it. Gill-rakers 6+11-13. 



Pectoral pore moderate. 



Distance of dorsal spine from shout 2J-24 in the 

 length; the spine \\-\.\ in the head, serrated on its in- 

 ner margin, granular or almost smooth on its outer 

 margin. Distance of adipose from the dorsal fin 3|-3| 

 in the length, the adipose fin shorter than the dorsal fin, 

 free posteriorly. 



Caudal forked, the upper lobe slightly the longer, 4-5 

 in the length. 



Anal fin scarcely longer than high, its highest ray 

 about 2 in the head. 



Ventral fin l§-2 in the head. 



Pectoral spine strong, about as long as the dorsal spine, 

 serrated on its inner margin, granular or scarcely rough- 

 ened on the outer ixiargin. 



Color brownish above, sides and ventral surface silvery, 

 sometimes with brown dots. 



Head 3-|-4; depth 5-5 J; D. I, 7; A. 21. 



We have examined over 70 specimens measuring from 

 .07-. 24 m. from Maranhao; Bahia; Rio Janeiro; Para; 

 Santos in Sao Paulo; Abrolhos, Brazil. 



The specimens from Para are much darker in color, 

 the lips more papillose,, the barbels longer than those 

 of other specimens. The Santos specimens are ashy 

 above, white below the lateral line, with rather large 

 brown dots on sides, becoming fewer below. 



62. Tachisurus fiirthii. 



Arius furthii Steindachner, SB. Ak. Wien, Ixxiv, 1876, Iclithyol. 

 Beitr. iv, 29 (Panama); [Jordan & Gilbert, Bull. U. S. Fish 

 Comm. 1882, 39 and 52 (copied). 



