140 CALIFORNIA ACADEMY OF SCIENCES. 



smooth; its height, including filament, 1| in head; 

 highest ray longer than the base of the fin, 1| in the 

 head. Distance of adipose fin from the dorsal equals the 

 length of the dorsal; adipose fin 2^ in the length. 



Caudal forked to the base, the upper lobe greatly pro- 

 duced, much longer than the head (broken off in the 

 specimen). 



Anal long and low, the posterior rays highest, 2J in 

 head, the tips when depressed not reaching the vertical 

 from the end of the adipose by more than one diameter 

 of the eye. 



Ventrals broad, reaching to the anal, If in head. 



Pectoral spine strong, 1-J in head, roughened along 

 both edges, the rays 1| in head. 



A black lateral band; region above it chocolate, below, 

 much lighter. Fins plain. 



Head 4|; depth 7; caudal peduncle 14; D. I, 6; A. 15. 



100, Ehamdella exsudans. 



Pimelodus exsudans Jeuyns, Voy. Beagle, Pishes, 111, 1842 (Eio 

 Janeiro?); Giinther, Cat. Fish. Brit. Mus. v, 132, 1864 (copied). 



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

 i, 130, 1888 (name). 



Habitat: ? Rio Janeiro. 



This species is known from the description of the types 

 which measure .089 and .057 m. 



101, Rhamdella jenynsii. 



Pimelodus gracilis Jenyns. Voy. Beagle, Fishes, 110, 1842 (Rio de 



Janeiro). 

 Pimelodus jenynsii Giinther, Cat. Fish. Brit. Mus. vol. v, 128, 1864 



(copied). 

 Rhamdia jenynsii Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. i, 130, 



1888 (Maldonado). 

 Habitat: Rio de Janeiro south to the Rio Plata. 



This species has so far been known only from the 

 types. The Museum of Comparative Zoology contains 9 

 specimens from Maldonado which, while they do not 

 agree with the description of the types in all respects 

 are too near to be considered distinct. 



