328 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



A Astyanax bimaatlatus (Linnaeus). La Plata to Panama. 

 ** Stewardia albipinnis Gill. Trinidad. 

 A Gynuiotiis carapo Linnaeus. La Plata to Rio Motagua. 

 A SyuibraiicJiits marinoratns Bloch. La Plata to Cuba. 



* HapIocJiihts harfi (Boulenger). Trinidad. 



* AcantJiopJiacelus guppii (Giinther). Trinidad. 

 W DoryJiauiphiis liiieatns Valenciennes. 



W Agonostonius moiiticola (Bancroft). West Indies, Trinidad. 



Me Mitgil brasiliensis Agassiz. 



Me Mitgil trichodoii Poey. 



W CentyoponiHS ensiferus Poey. 



W CentyoponiHS iindecinialis Bloch. 



Polycentrus schonibnrgkii Miiller & Troschel. Trinidad. 



Alqiiidens pnlcJiriim (Gill.) Chagres, Trinidad. 

 A Cichlasoma bimaculatuni (Linnaeus). Paraguay to Trinidad. 

 A Crenicichla saxatilis (Linnaeus). Amazon to Trinidad. 

 W Dovniifator niaculatiis Bloch. 

 W PJiilypnns doymifatoy (Lacepede). 

 ** Evoythodus byeviceps Gill. Trinidad and Surinam. 

 W Chonophoyiis banana (Cuvier & Valenciennes). 



* Gobiiis fasciatus (Gill). Trinidad. 



7. Southeast oy East Byazilian Plaieati. 



The southern land-mass, Archamazona, the Brazilian plateau, is drained 

 by the Tocantins, Rios San Francisco, Doce, Jequitinhonha, Parahyba 

 and other coast streams and the upper tributaries and head-waters of the 

 Parana. The rivers leave this mass over important falls. The Parana 

 is part of the La Plata system, and as far as it may be considered, will 

 be taken up with the La Plata. 



This old land-mass was doubtless more extensive in the past. The 

 isolated ranges or peaks in the territory west of the Araguay are the prob- 

 able remnants of the formerly more extensive plateau. The falls in the' 

 Tocantins, Xingu, Tapajos and Madeira mark the probable northern and 

 western boundary of this plateau. However, west of the Rio San Fran- 

 cisco, the streams all drain into the Amazon and their fauna could not 

 have retained its original character. The western streams probably con- 



