378 



PATAGONIAN EXPEDITIONS : ZOOLOGY. 



Narcine corallina Garman; Narcine 

 umbrosa Jordan; Torpedo bancrojti 

 Griffith; Narcine nigra Dumeril; 



Torpedo pictus Gronow. 

 Habitat : Pensacola and Key West to 

 Brazil, entering rivers. 



Suborder MASTICURA 

 Family MYLIOBATID^. 

 Myliobatis Dumeril. 



Holorhinus Gill. 



Type : Raja aquila Linnaeus. 



Range: Warm seas. 

 I. Myliobatis aquila (Linnaeus), 



Giinther, VIII, 489 

 Habitat: All warm seas; La Plata. 



Family DASYATID^E. 



Paratrygon Dumeril. 



Disceus Garman. 



Type : Trygon aiercba Cuvier. 

 Range that of the single species, 

 Ai. Paratrygon strongyloptcrus (Schom- 



burgk), Giinther, VIII, 476. 



Trygon aiereba Dumeril ; Trygon or- 

 bicularis Giinther. 

 Habitat: British Guiana; Amazons. 



Potamotrygon Garman. 



Type: Pastinaca humboldtii Roulin. 

 Range : Fresh waters of South America. 

 1. Potamotrygon brachyurus (Giinther), 



Giinther 1880, 8. 

 Habitat: La Plata. 

 A2. Potamotrygon humboldtii (Roulin). 

 Trygon hystrix Miiller & Henle. 

 ? Trygon garrapa Schomburgk. 

 Habitat : Rivers from the La Plata to 

 the Orinoco; Paraguay, Rio 

 Branco; Orinoco at Apure. 

 3. Potamotrygon d'orbignyi (Castelnau), 

 Giinther, VIII, 484. 

 Habitat: Orinoco. 



A4. Potamotrygon reticulatus Giinther, as 

 hystrix Giinther, VIII, 482. 

 Habitat : Surinam ; Santarem. 

 5. Potamotrygon magdalcncc 1 (Steindach- 



ner) Steindachner, 1878, 56. 



Habitat : Rio Magdalena. 

 A6. Potamotrygon vwtoro (Miiller & 



Henle) Giinther, VIII, 484. 



Trygon henlci Castelnau ; Trygon gar- 

 rapa Schomburgk; Tccniura miillcri 

 and henlei Castelnau. 

 Habitat: Rio Cuyaba; Rio Bianco. 

 A7. Potamotrygon dumerilii (Castelnau), 

 Giinther, VIII, 484. 

 Habitat: Araguay; Tocantins; Rio 

 Crixas; Paraguay. 



Ellipesurus Schomburgk. 



Type : Ellipesurus spiuicauda Schom- 

 burgk. 

 Range that of the single species. 

 Ai. Ellipesurus spiuicauda Schomburgk, 



Giinther, VIII, 472. 

 Habitat: Rio Jurua; Rio Branco. 



1 Garman considers d'orbignyi and magdalena: syn- 

 onymous with humboldtii. 



