MIKIIK-E. OCTODON. 185 



HABROCOMA. 



Teeth :— Incisors ti ; Molars £* ; =20. 



Bennett's Haisrocoma. Habrocoma bennettii. 



Molina, Storia del Chile, pi. 6. fig. 5 (skull), tig. 5 a, b, c (dentition). 

 — Waterhoitsc, Nat. Hist. Mamm. ii. p. 248. pi. 8. fig. 1 (skull and 

 lower jaw). 



Cervical vertebra 7 



Dorsal 17 



Lumbar 5 



Sacral 4 



Caudal 23 



a, b, c. *Skulls. Chili. From Mr. Bridges' Collection. 



d. Skull : young. Chili. From the Zoological Society's Collection. 



0CT0D0N. 



Teeth :— Incisors |=j ; Molars |=* ;=20. 



Bridges' Octodon. Octodon bridgesii. 



Waterhouse, Nat. Hist. Mamm. ii. p. 259. pi. 8. figs. 3 & 2 b (skull and 

 lower jaw). 



a-c. *Skulls. Chili. From Mr. Bridges' Collection. 



The Cucurrito or Degus. Octodon degus. 



Waterhouse, Nat. Hist. Mamm. ii. p. 253. pi. 8. figs. 2 & 2 a (skull and 



lower jaw). 

 Octodon cumingii, Molina, Storia del Chile, pi. 6. fig. 7 (dentition). — 



Brandt, Mem. Acad. St. Petersb. iii. pi. 7. figs. 9-14 (skull). 

 Dendrobius degus, Schreb., Saugth. iv. pi. 239 c, d. fig. 1 (dentition). 



Cervical vertebrae 7 



Dorsal 12 



Lumbar 6 



Sacral 4 



Caudal ■ 26 



a. Skeleton. "\ 



b. SkuU. 



*c. Skull (white var.). y Chili. From Mr. Bridges' Collection. 



•d. SkuU. 



e, f. Skeletons. 



g. Skull (white var.). From the Zoological Society's Collection. 



The Dormouse Octodon. Octodon gliroides. 

 D'Orb., Voy. be. pi. If,, fig. (skull). 



