eigenmann: fresh water fishes. 347 



A yEqitidens dorsigera (Heckel). 



* Aiquidens pavagitayeusis Eigenmann & Kennedy. 

 A ^qnideus vittafa (Heckel). 



A CicJilasoma biinaculata (Linnaeus). 



* HeteyograniDia coninibcc Eigenmann & Ward. 



* Heterogramma borellii Regan. 



* Heterogramina trifasciatmn Eigenmann & Kennedy. 

 A Mesonanta festivus (Heckel). 



A Crenicichla lepidota Heckel. 

 A CrenicicJila adspersa Heckel. 

 A Crenicichla vittata Heckel. 

 A CrenicicJila saxatilis (Linnaeus). 

 / Batrachops seniifasciata Heckel. 



* Batrachops ocellata Perugia. 



* Satanoperca pappaterra Heckel. 



* Geophagns bahanii Perugia. 

 Geophagus ej'nrnpari Heckel 



/ Achirus jenynsii (GUnther). 

 It is seen that over 53 per cent, of the total are species that are also 

 found in the Amazon basin; 36 per cent, are peculiar, and over 15 per 

 cent, are common to the Paraguay and eastern Brazil. The proportions 

 common to the Amazon and the Paraguay are not the same for all genera. 

 All of the species of Sternopygida: (7), Schizodon (4), Leporimts (7) 

 Serrasabnonince (8), and five out of seven My lines found in the Paraguay 

 basin are also found in the Amazon. A comparison of the number of 

 species common to the Paraguay and to the Amazon and to the Paraguay 

 and eastern Brazil leaves no doubt as to the origin of the fauna of the 

 Paraguay. It came from the Amazon. 



The Parana and La Plata. 



The fauna of the Parana and La Plata, as far as known, is quite 

 different from that of the Paraguay. Much of this difference is probably 

 apparent rather than real. The Parana is divisible into two regions — 

 that above the falls with its tributaries belonging to the Brazilian plateau 

 has been mentioned before. Its fauna is very imperfectly known from 

 collections made by Natterer at Irisanga and incidentally described by 

 Kner, and from a collection made by Von Ihering in Sao Paulo and 

 described by Eigenmann & Norris. 



