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 2j 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, 2| 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, 1| in head. 



Pectoral spine strong, 1| in head, roughened along 

 both edges, the rays I5 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. Rhamdella exsudans. 



Pimelodus exsuda7is Jenyus, Voy. Beagle, Fishes, 111, 1842 (Eio 

 Jaueiro?); Gtiuther, Cat. Fish. Brit. Miis. v, 132, 1864 (copied). 



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

 1, 130, 1888 (name). 



Habitat: ? Rio Jaueiro. 



This species is known from the description of the types 

 which measure .089 and .057 m. 



101. Rhamdella jenynsii. 



Pimelodus i/racilis Jenyus. Voy. Beagle, Fishes, 110, 1842 (Rio de 



Janeiro). 

 Pimelodus jenynsii Gtiuther, 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 Jaueiro 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. 



