216 NOCTURNAL LIFE OP ANIMALS. 



always have both eyes on one side of the body) ; for example, the 

 Limande (Pleuronectes Limanda), which comes up the Loire to Or- 

 leans. Some sea forms of fish, as dolphins and skates, are repeated 

 in the great rivers of both continents. The fresh-water dolphin of 

 the Apure and the Orinoco differs specifically from the Delphinus 

 gangeticus, as well as from all sea-dolphins. (See my Rel. hist. t. ii. 

 pp. 223 239, 406-413.). 



( 6 ) p. 212. " The striped nocturnal monkey" 

 This is the Douroucouli, or Cusi-cusi of the Cassiquiare, described 

 by me as Simia trivirgata in my Recueil d'Observations de Zoologie 

 et d' Anatomic comparee, t. i. pp. 306- 311, tab. xxviii., the plate be- 

 ing taken from a drawing made by myself from the living animal. 

 We subsequently saw this nocturnal monkey living in the menagerie 

 of the Jardin des Plantes at Paris. (See the work above cited, t. ii. 

 p. 340.) Spix also found this remarkable little animal on the Ama- 

 zons River, and called it Nyctipithecus vociferans. 



POTSDAM, June, 1849. 



