88 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
Family — CHINCHILLID iE. 
Lagostomus trichodactylus. 
Lagostomus trichodactylus, Brooks , Transactions of the Linnean Society, vol. xvi. p. 95, PI. 9. 
La Vizcache, Azara, Essais sur l’Histoire Naturelle des Quadrupedes de la Province du Paraguay, 
vol. ii. p. 41. Trad. Franc. 
Vischacha, Meyen , Acta Academise, c. 1. c. Naturae Curiosorum, Tom. xvi. pars 2, p. 584. 
Habitat, La Plata. 
“ I will not repeat what I have said about the habits of this animal in my 
Journal, as it is merely a corroboration of Azara’s account. According to that 
author, the Bizcacha is not found north of 30°; and its southern limit occurs in the 
neighbourhood of the Rio Negro in 41°. Where the plains are gravelly, it is not 
abundant, but (differently from the Cavia Patagonica,) it prefers an argillaceous and 
sandy formation, such as that near Buenos Ayres. The Bizcacha abounds over 
the whole Pampas, even to the neighbourhood of Mendoza, and there it is replaced 
in the Cordillera by an Alpine species. Of the latter animal, I saw one seated on 
a pinnacle at a great height, but I could not obtain a specimen of it. Azara* has 
remarked that the Bizcacha, fortunately for the inhabitants of Banda Oriental, is 
not found to the eastward of the Rio Uruguay ; and what makes the case more 
remarkable is, that although thus bounded by one river, it has crossed the broader 
barrier of the Parana, and is numerous in the province of Entre Rios. I was 
assured by a man, whose veracity I can perfectly trust, that these animals, quasi 
canes, post coitum adnexi sunt.” — D. 
Family — CAVIIDJE. 
Kerodon Kingii. 
Kerodon Kingii, Bennett , Proceedings of the Zoological Society of London for 1835, p. 190. 
Habitat, Patagonia. 
“ The Kerodon is common at intervals along the coast of Patagonia, from the 
* Azara ‘ Voyages dans l’Amerique Meridionale,’ vol. i. p. 316. 
