MAMMALIA. 689 



tot de natuurk. Wetenschappen, vi. 1831, bl. 105 118, PI. 2. (The opinion 

 now prevails very generally that there are two species ; one larger with 

 shorter tail, Chinchilla brevicaudala WATERH., Eriomys chinchilla LICH- 

 TENST., WAGN., LICHTENST. Darstellung, Tab. 28, and Chinchilla lanigera 

 WATERH., Eriomys laniger WAGN., Eriom. pellionum mihi, to which the 

 figures of F. CUVIER and BENNETT refer.) 



6) Fore feet tetradactylous. Ears elongate. Lagidium MEYEN, Lagotis 

 BENNETT. 



Sp. Eriomys Cuvierti, Lagotis Cwvierii BENNETT, On the Chinchillidce and a 

 new Genus, Trans, of theZool. Soc. I. 1833, pp. 35 64; Eriomys peruanus, 

 Lagidium peruanum MEYEN, Lagotis pallipes BENNETT 1. 1. i. 4, 1834, pp. 

 331334, PL 42. 



Lagostomus BROOKES. Molar teeth formed of two transverse 

 lamellae, except the last upper formed of three lamellae. Whiskers 

 long, strong, numerous. Fore feet tetradactylous, hind feet tridac- 

 tylous, with middle toe long, with claws long, compressed. Tail 

 shorter than half the body, covered with longish hair. 



Sp. Lagostomm trichodactylus BROOKES, Linn. Transact. XVI. r, pp. 95 104, 

 Tab. ix., LESSON III. de Zool. PI. 8, WATERHOUSE Mamm. n. PI. 5, fig. i ; 

 the Viscacha (Dipus maximus BLAINV., DESMAR.) ; grey-brown, white be- 

 low, a dark black spot along the cheeks ; some longer black hair on the 

 back and along the sides. This large rodent lives in South America, east- 

 wards from the chain of the Andes to 41 S.L., in the plains (Pampas). 



* Family XXX. Dipoda WAGN. Molar teeth , - 



3-3 4-4' 3-3 



or -^ , complex, mostly supplied with roots. Fore feet short, 

 o o 



hind feet elongate, saltatory. Tail long, furnished with long hair. 

 Eyes large. Clavicles perfect. Infra-orbital foramen very large, 

 placed in front of the orbit and resembling a second orbit. 



Pedetes ILLIG., Helamys F. Cuv. Incisors smooth, broad, 



4-4 

 the inferior with apex broad, truncated ; molars ^ > without 



, roots, with crown divided into two transverse, oval portions by a 

 fold, external in the upper, internal in the lower. Ears elongate. 

 Fore feet pentadactylous, with claws elongate, acuminate ; hind feet 

 tetradactylous, very long, with claws ungulseform. Tail long, 



jL _ ^ i _ ^ 33 



: tufted. (Dent. form. OWEN, i. ^ =- , p. ^ = , m. = 20.) 



1 1 '1 1 o o 



VOL. ii. 44 



