104 CALIFORNIA ACADEMY OF SCIENCES. 



70. Pinirampus pirinampu. 



Pimelodus pirinampu Spix, Gen. et Spec. Pise. Bras. 20, pi. viii, 



1829 (Brazil); Schoniburgk, Fishes Guiana, part i, 183, 1841 



(Guiana); Castelnau, Aiiim. Amer. Sud, Poiss. 35, 1855 



(Amazon). 

 Pinirampus pirinampu Eigenm. & Eigeum. Proc. Cal. Acad. 2d Ser. 



vol. i, 1888, 121 (Cameta). 

 Pimelodus pirinampus Cuv. & Val. Hist. Nat. Poiss. xv, 196, 1840 



(Brazil); ? Kiier, SB. Ak. Wieu, xxvi, 1857, 416 (loc.?). 

 ? Pimelodus barbancho Humboldt, Kec. Obs. Zool. ii, 172, 1833 



(Venezuela). 

 Pinirampus typus Bleeker, Nederl. Tijdschr. Dierkuude, i, 100, 1863 



(name only). 

 Pirinampus typus Giinther, Cat. Fish. Brit. Mus. v, 135, 1864 



(copied). 

 Habitat: Kio Tocantins to Venezuela. 



From Dr. Steiiidachner's statement that his Piniram- 

 pus agassizii differed from pirinampu Kner only in hav- 

 ing the postorbital portion of the head granulated, we 

 judge that the specimens mentioned by Kner, 1. c. (which 

 Steindachner had for comparison) were not the piri- 

 nampu Ag., for the specimen figured by Steindachner 

 as agassizii is wholly unlike and generically distinct 

 from specimens which agree in all respects with Agas- 

 siz's description of pirinampu. 



Two specimens .455 m. and .38 m. long, collected by 

 Professor Louis Agassiz at Cameta. 



Body elongate, compressed to a ridge above, the caudal 

 peduncle subcylindrical. Head depressed above the 

 eyes, and forward to the posterior nasal openings, the 

 profile rather steep from the occipital crest to the poste- 

 rior margin of the eyes, thence less inclined, again de- 

 curved from the posterior nostrils forward, the tip of the 

 snout convex, the upper jaw little longer than the lower; 

 the greatest width of the head (from opercle to opercle) 

 one-fifth greater than the depth at base of the occipital 

 process, and 1J in its length; its width at the angle of 

 the mouth lf-1^ in its length. Fontaiiel not continued 

 behind the eye, but a groove extends to the occipital 



