130 CALIFORNIA ACADEMY OF SCIENCES. 



body and rather small eyes; Rio Parahyba: reddish 

 brown with dark markings, caudal black; Rio Grande 

 do Sul, Emperor's collection, one specimen, has D. I, 7. 



89. Rhamdia multiradiatus. 



Pimelodus multiradiatus Kner, SB. Ak. Wieii, xxvi, 414, 1857, 



(Borba on the Kio Madeira; Forte do Kio Branco on the Rio 



Facutu). 

 Notoglanis multiradiatus Giinther, Cat. Fish. Brit. Mus. v, 136, 1864 



(copied). 

 Rhamdia multiradiatus Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 



i, 126, 1888 (name). 

 Pimelodus arekaima Schornburgk, Fish. Brit. Guiana, part i, 178 



(not plate v), 1841 (Upper Essequibo). 

 Habitat: Amazon and its tributaries, and northward. 



90, Rhamdia sapo, 



Pimelodus sapo Valenciennes, in Voy. d'Urbigny, ix, Atlas ii, pl.ii, 

 figs. 6-8, 1847; Cuv. & Val. Hist. Nat.Poiss. xv, 179, 1840 (Bue- 

 nos Ayres); Kner, SB. Ak. Wien, xxvi, 417, 1857 (loc.?); Giin- 

 ther, Cat. Fish. Brit. Mus. v, 132, 1864 (Kio Plata); Steindach- 

 ner, SB. Ak. Wien, Ix, 1869, Ichthyol. Notiz. ix, 5 (Montevi- 

 deo); Hensel, Wiegm. Arch. 1870, i, 69 (Guahyba). 



Pimelodus (Rhamdia} sapo Steindachner, SB. Ak. Wien, Ixxiv, 1876, 

 Siisswasserfische siidostl. Bras, iii, 60 (La Plata; Kio Grande 

 do Sul). 



Rhamdia sapo Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. i, 126, 

 1888 (Rio Grande do Sul). 



Habitat: Kio Plata; southern Brazil. 



Five specimens from .18-. 405 m. in length, from the 

 Rio Grande do Sul, the Emperor's collection. 



Body rather robust, its greatest width less than its 

 greatest depth. 



Head elongate, flat above, its greatest width 1J in its 

 length; width at the angle of the mouth 2 in head; the 

 head entirely covered with skin; fontanei not continued 

 behind the eye; occipital process small, imbedded. Large 

 patches of radiating pores between and behind the eyes, 

 on the upper and lower angles of the opercle; the patches 

 with fewer pores in some individuals; in the adult the 

 pores on top of the head become detached and circular; 

 minute, inconspicuous pores scattered everywhere about 

 the head. 



