MURID.E. SriGGTTRUS. 193 



The Mexican Tkek Pokcutine. Cercolabes novae-hispaniae. 



Waterhouse, Nat. Hist. Mamm. ii. p. 422. pi. 18. fig. 4 (bones of right 

 fore-foot). 



*«. Skull. 



The Peruvian Tree Porcupine. Cercolabes nycthemera. 

 Waterhouse, Nat. Hist. Mamm. ii. p. 417, 1848. 

 *a. Skull. 



ERETHIZON. 

 Teeth :— Incisors g ; Molara £-* ; = 20. 



The Cawquaw or Urson. Erethizon dorsatus. 



F. Cuv., Mem. du Mus. ix. p. 4-32. tab. 20. figs. 1, 2 (skull), 1822.— 

 Baird, Mamm. N. America, p. 5G9. pi. 55. no. 3066 (teeth). — 

 Brandt, Mem. Acad. St. PtStersb. vii. tab. 9. figs. 1-7 (skull). 



Hystrix dorsata, Blainv., Osteog. G. Hystrix, pi. 3 (skull). 



Cervical vertebrae 7 



Dorsal 14 



Lumbar 6 



Sacral 3 



Caudal 17 



*a. Skull. Central America. 1 From the Zoological Society's Col- 



b. Skeleton. J lection. 



e. Skull : young. From Mr. Yarrell's Collection. 



Erethizon epixanthus. 



Brandt, Mamm. Exot. p. 55. pi. 9. figs. 1-3 (skull).— Baird, Mamm. 

 N. America, p. 569. pi. 55. no. 1263 (teeth), 1859. 



Cervical vertebra? 7 



Dorsal 14 



Lumbar 6 



Sacral 3 



Caudal 17 



a. Skeleton. Cabfornia. From Mr. Brandt's Collection. 



SPIGGURUS. 

 Teeth :— Incisors £j ; Molars £ ;=20. 



The Orico. Spiggurua insidiosus. 

 Hystrix insidiosa, Blainv., Osteog. U. Hystrix, pi, 3 (skull). 



Cervical vertebra; 7 



Dorsal 16 



o 



