140 CALIFORNIA ACADEMY OF SCIENCES. 



twice as long as its greatest width, its margins straight and 

 oblique; the middle of the fontanel above the posterior part 

 of the eye. Head everywhere covered with skin; sides of 

 the head and opercle with vermiculating canals. 



Eye 2J in snout, 8J in head, 4^ in interocular, 2^ in in- 

 terorbital. 



Snout somewhat pointed; upper jaw very little project- 

 ing; lips thick, teeth all villiform, the intermaxillary band 

 strongly curved. Vomerine teeth in two oval patches, 

 joined to the larger patches of the palatines. Mandibulary 

 bands separate in front; the outer margins, if continued 

 forward, forming an angle at the symphysis. 



Maxillary barbels reaching beyond base of pectorals; 

 mental barbels reaching about | tow-ard the gill opening, 

 the post-mentals to the gill opening. 



Gill membrane forming a broad free margin across the 

 isthmus. Gill rakers 3 -)- 4. Pectoral pore minute. Hum- 

 eral process pointed behind. 



Distance of the dorsal from the snout 2| in the length. 

 The dorsal spine covered with a membrane, its outer mar- 

 gin granular; its height If in the head, the first soft ray .l| 

 the length of the fin. Distance of adipose fin from the 

 dorsal 31-4 in the length, the fin adnate, longer than the 

 dorsal. 



Caudal lunate, the upper lobe longer, somewhat falcate, 

 4|-5 in the length. 



Anal fin tnice as long as high, the highest ray 2-2J in the 

 head. 



Yentrals short and broad, I5 in the head. Pectoral spine 

 covered with a membrane, l^-lf in head. 



Light brown, becoming nearly white below, the sides 

 freckled; fins reddish. 



Head 4-4J; depth 5-6; D. I, 6; A. 22. 



87. Tachisurus peruvianus (Lutken). 



Locality: Callao. 



