58 CALIFORNIA ACADEMY OF SCIENCES. 



granular; the granules arranged in series along the fon- 

 tanel. Occipital process inucronate, broader than long; 

 dorsal plate large, butterfly-shaped. Opercle striate; 

 fontanel 1| times as long as the eye, its center in front 

 of the middle of the eye, continued as a shallow groove. 

 Eye 1J- 1J in snout, 5J-8 in head, lf-2 in the inter- 

 orbital, 2J-3f in the interocular. 



Jaws sub-equal; teeth all villiform, the 



^ -^""T-^ intermaxillary band very wide and shal- 

 C^ V^7 r^ low; teeth on the roof of the mouth in 

 \ \ ( / s i x contiguous patches. 



Gill-membranes meeting in an angle, 

 forming a broad fold across the isthmus. Gill-rakers 

 5+10. 



Pectoral pore large; vertical series of pores. 



Distance of dorsal spine from the snout, 2f in the 

 length; the dorsal spine granular in front, striate on the 

 sides, weakly serrate behind, its length 1J 1J in the 

 head. Space between dorsal and adipose fins 2f-3 in the 

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

 posterior margin free. 



Caudal deeply forked, its upper lobe longer, 4-4 J in 

 the length. 



Anal emarginate, as high as long, 2-2 J in the head. 



Ventrals 2. in the head. 



Pectoral spine roughened or granular in front, serrated 

 behind, If-lJ in the head. 



Plumbeous above, with blue lustre, white below; max- 

 illary barbels dark, the mental barbels white; fins all 

 more or less dotted with brown. 



Head 4-4 J; depth 7; D. I, 7; A. 18. 



Five specimens .25-. 46 m. long; Pernambuco; 

 Hartt & Fletcher. 



31, Tachisurus passany. 



Bagrus passany Cuv. &. Val. Hist. Nat. Poiss. xiv, 458, 1839 

 (Cayenne). 



