250 The South American Cat-Jishes 



Marajo, near the mouth of the Amazon ; there is, therefore, now 

 no genus known to be peculiar to the LaPlata. These specimens 

 which belong to the species Cochliodon cochliodcm are of par- 

 ticular interest, inasmuch as the genus and species has heretofore 

 been known onl}^ from the t^^pes in the Museum of Vienna. 



From the Rio San Francisco there are but four specimens — all 

 of a species common to the mouths of the east coast rivers of 

 Brazil. The rivers of south-eastern Brazil, which Dr. Eigenmann 

 has shown to have a fish fauna distinct from that of the Amazon 

 on the north and the LaPlata on the south, are not represented 

 in the collection. 



Lake Titicaca is represented by a single specimen, Pigidium 

 7-ivulatum, collected b}^ Mr. S. Garman. This species with Rham- 

 dia quellen are the onlj- cat-fishes found in Lake Titicaca. Both 

 of these are alpine forms chai'acteristic of the mountain streams 

 of the Peruvian Andes. 



SILURID.E. 



PiMELODINyE. 



1. Rliaindia sel>ae kneri (Steind.) One specimen. Marajo on 

 Tocantins. 



2. Piiuelodella cristatus (Miill. <k Troch.) One specimen, 



Brazil. 



3. Pimelo(lii!« clarias (Bloch.) 1754, 1755, 1756, 1738, 1739, 

 Para. 



4. IIeiui!i)03>ii1)iin platyrliyiiclios (Cuv. & Yal.) 1750, 1751. 

 Para. 



5. Pseudoplatystoiua fasciatiini (Linn.) 1716. Para. 



DORADIN.E. 



Analysis of the genera of DoV(((lin(V, 



a. Barbels all simple. 



b. Eye in the anterior portion of the head ; snont depressed ; teeth 

 well developed. 

 c. Humeral processes much shorter and weaker than the coracoid 

 process. No adipose dorsal ; gill openings greatly reduced. Clav- 

 icle and coracoid forming a large shield below. 



Physopyxis Cope. 



