38 CALIFORNIA ACADEMY OF SCIENCES. 



Caudal deeply forked, 3-3i in the length. 



Base of anal 5|-6i in the length, the highest anal 

 ray about equal to the length of the base. 



Base of ventral nearer to base of caudal than to the 

 snout, the rays sometimes reaching to origin of anal, 

 1|-1| in head. 



Pectoral spine 11-1 in head, the filament reaching to 

 origin of anal, much shorter in the adult. 



Bluish purple above, silvery below, lower portion of 

 the side of the head and body thickly covered with 

 brown dots; dorsal, inner surface of pectorals and ven- 

 trals and the anterior portion of the anal thickly covered 

 with purplish dots. 



Head 4-4^; depth 4^-5^; D. I, 7; A. 20-24. 



The specimens examined are from Rio de Janeiro; 

 Para; Bay of Balaxy; Mobile Bay; Pernambuco; Vic- 

 toria, Brazil. 



VIII. Genidens. 



Genidens Castlenau, Anim. Nouv. ouRares Amer. Sud, 

 Poiss. 33, 1855 {ciivieri-= genidens). 



Barbels six. Postorbital portion of the head granular, 

 covered with very thin skin. Occij)ital process trian- 

 gular, strongly keeled and articulating with the dorsal 

 plate. Fontanel extending considerably beyond the 

 eye and continued as a groove behind it. Palatine 

 teeth in small patches which are aggregated in two oval 

 patches on*the sides of the palate; the patches of teeth 

 resting on the thick fleshy cushion. Dorsal composed 

 of a spine and seven rays. Caudal forked. 



22. Genidens genidens. 



Bagrus gejiidens C\\y. & Val. Hist. Nat. Poiss. xiv, 4.52, Ipl. 419, 



1839 (Eio de Janeiro). 

 Genidens genidens Eigenm. & Eigenm. Proc. Cal. Acad. Sci. 2d Ser. 



vol. i, 1888, 148 (Porto Alegre; Santos; Eio Janeiro; Eio Sao 



Matheos; Eio Grande do Sul). 



