RODENTIA. 309 



species ; Poephagomys, one ; Octodon, one ; and, 

 Abrocoma, one all animals externally bearing re- 

 semblance to rats. They are natives of South 

 America. We now come to 



The Chinchillidce, a small family entirely herbi- 

 vorous, with a dentition we have not been able to 

 ascertain. They have four toes and a rudiment on 

 the anterior, and only three toes on the posterier 

 extremities. The species known, are, Chinchilla, 

 one; Lagotis, two; and Lagostomus, one. We 

 figure 



PLATE XXVI. 



Chinchilla Diana, Viscachial 



A SPECIMEN under this name was formerly in the 

 possession of Mr. Cross, already engraved in Grif- 

 fith's Cuvier. We could not find, at the time, an 

 opportunity of examining the animal, which was in- 

 accessible for that purpose. 



THE CAVIID^E, 



ALL natives of America, among which the Cavia 

 cobaia, or Guinea Pig, is well known. There are, of 

 this family, the genus CAVIA, six species ; Kero- 

 don, two ; Dolichotis, one ; and 



