204 MURID-E. DIFUS. 



Sacral vertebra 3 



Caudal 20 



a. Skull. Peru. Presented by W. Watson, Esq. 



b. Skull. Peru. 



c. Skeleton. Chili. From Mr. Bridges' Collection. 



d. e. Skeletons. Chili. Presented by H. Cuming, Esq. 



/, g, h. Skeletons. From the Zoological Society's Collection. 



LAG0ST0MUS. 



Teeth :— Incisors \^ ; Molars ~ ; = 20. 



The Viscacha. Lagostomus trichodactylus. 



Waterhouse, Nat. Hist. Mamm. ii. p. 212. pi. 10*. fig. 3 (skull).— 

 Brooks, Liuu. Trans, xvi. p. 95. tab. 9, cop. — Isis, 1830, p. 906, 

 taf. 9. fig. b (skeleton), figs, c, d (skull aud lower jaw). 



*<r. Skull. Chili. From Mr. Bridges' Collection. 



HELAMYS. 



Teeth :— Incisors J=| ; Molars 4 -^ ; = 20. 



1-1 7 4-4 



The Spring Haas. Helamys capensis. 



Cuv., Oss. Foss. v. pi. 1. fig. 21 (teeth). — F. Cur., Dents des Mamm. 



p. 152. no. -49 (teeth). 

 Pedetes caft'er, Brandt, M6m. Acad. St. Petersb. vii. pi. 6. figs. 1, 8 



(skull). 



Cervical vertebra 7 



Dorsal 12 



Lumbar 7 



Sacral 3 



Caudal 29 



a. Teeth. Cape of Good Hope. 



6. Skull: young. Capo of Good Hope. From the Zoological Society's 



Collection. 

 c. Skeleton. Cape of Good Hope. Presented by Sir A.Smith. 



DIPUS. 



Teeth : — Incisors tl ; Molars ~ ; = 16. 



3-3 



The ItoiroH- footed Gerboa. Dipus hirtipes. 



Waterhouse, Charlesw. Mag. Nat. Hist. 1839, p. 9. figs. a, b (skull), 

 p. 186. figs, a, 6(skuH). — Schreb., Saugth. iv. pi. 239 e. fig. (dentition). 



Skull. Sennaar. From the Stockholm Collection. 



