MAMMALIA, 689 



tot de natuurh. Wetenschappen, vi. 1831, bl. 105 — ti8, PI. 2. (The opinion 

 now prevails very generally that there are two species ; one lai-ger with 

 shorter tail, Chinchilla hrevicaudcUa Waterh., Eriomys chinchilla LiCH- 

 TENST., Wagn., Lichtenst. Darstellung, Tab. 28, and Chinchilla lanigera 

 Waterh., Eriomys laniger Wagn., Eriom. pellionum milii, to which the 

 figures of F. Cuvier and Bennett refer.) 



b) Fore feet tetradactylous. Ears elongate. Lagidiuni Meyen, Layotis 

 Bennett. 



Sp. Eriomys Cuvierii, Lagotls Cuvierii Bennett, On the Chinchillidce and a 

 new Genus, Trans, of the Zool. Soc.l. 1%^^, pp.35 — 64; — Eriomys peruanus, 

 Lagidium 2:>eriianum Meyen, Lagotis paUipes Bennett 1. 1. i. 4, 1834, pp. 

 331—334, PI- 42. 



Lagostomus Brookes. Molar teeth formed of two transverse 

 iamellge, except the last upper formed of three lamellas. Whiskers 

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

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

 shorter than half the body, covered with longish hair. 



Sp. Lagostomus trichodactylus Brookes, Linn, Transact, xvi. i, pp. 95 — 104, 

 Tab. IX., Lesson III. de Zool. PI. 8, Waterhouse Mamvi. 11. PI. 5, fig. i ; 

 the Viscacha {Dipus maximus Blainv., Desmar.) ; grey-brovni, 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). 



4—4 4—4 

 Family XXX. Dipoda Wagn. Molar teeth j — ^ > — 5 



00 rt O O 



or 'o — q J complex, mostly supplied with roots. Fore feet short, 



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

 Eyes large. Clavicles pei-fect. 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 j — - , 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 ungulgeform. Tail long, 



1 — 1 1 — 1 3—3 



tufted. (Dent. form. Owen, i. :, r , p. :j — - , m. .3 — ^ = 20.) 



VOL. II. 44 



