On the range of hills from which the lofty Andes de Cuchao have originated, see my Relation historique, t. iii. p. 238.
[68]. p. 197.—“Hermesia.”
The genus Hermesia, the Sauso, has been described by Bonpland, and is delineated in our Plantes équinoxiales, t. i. p. 162, tab. xlvi.
[69]. p. 199.—“The fresh-water dolphin.”
These are not sea dolphins, which, like some species of Pleuronectes (flat fish which invariably have both eyes on one side of the body), ascend the rivers to a great distance, as, for instance, the Limande (Pleuronectes Limanda), which is found as far inland as Orleans. Some forms of sea fish, as the dolphin and skate (Raia), are met with 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.[[IL]]
[70]. p. 199.—“The striped nocturnal monkey.”
This is the Douroucouli or Cusi-cusi of the Cassiquiare which I have elsewhere described as the Simia trivirgata,[[IM]] from a drawing made by myself of the living animal. We have since seen the nocturnal monkey living in the menagerie of the Jardin des Plantes at Paris.[[IN]] Spix also met with this remarkable little animal on the Amazon River and called it Nyctipithecus vociferans.
Potsdam, June 1849.
HYPSOMETRIC ADDENDA.
I am indebted to Mr. Pentland, whose scientific labours have thrown so much light on the geology and geography of Bolivia, for the following determinations of position, which he communicated to me in a letter from Paris (October 1848), subsequent to the publication of his great map.