5*8 



POPULAR SCIENCE MONTHLY 



1. Calomesus psittncus (Bkch & Schneider) a Marine Type widely distributed 



in the Rivers. 



Hatcheria, a Mountain Catfish. Relatives of this Species Range from Venezuela 



to Patagonia. 



3. A Corydoras, an Armored Relative of the Catfish 



4. Pir7ielodella(/i-aciUis'VAi..,OsE of the Smaller Catfishes about Natural Size. 



north to 35° south latitude, and from 50° to 79° west longitude, pro- 

 viding a continuous north and south waterway of more than three 

 thousand miles, and an east and west course of over two thousand miles, 

 and embracing the Orinoco basin, the Amazon basin and the La Plata 

 basin, draining over 3,000,000 square miles of territory, or an area 

 about equal to that of the United States, exclusive of appendages. 



2. Paucity of Types. 



There are found in the rivers of South America representatives of 

 many marine fishes. Soles, swellfish, stingrays, needlefishes, mullets, 



