MURID.E.—-SPIGGURUS. 193 
The Mrxtcan Tree Poxcurinr. Cercolabes nove-hispaniz. 
Waterhouse, Nat. Hist. Mamm. ii. p. 422. pl. 18. fig. 4 (bones of right 
fore-foot). 
*a. Skull. 
The Peruvian Tree Porcurine. Cercolabes nycthemera. 
Waterhouse, Nat. Hist. Mamm. ii. p. 417, 1848. 
*a. Skull. 
ERETHIZON. 
Teeth :-—Incisors 2 ; Molars = ;= 20. 
The Cawauaw or Urson. Erethizon dorsatus. 
F, Cuv., Mém, du Mus. ix. p. 432. tab. 20. figs. 1, 2 (skull), 1822.— 
Baird, Mamm. N. America, p. 569. pl. 55. no. 8066 (teeth).— 
Brandt, Mém. Acad. St. Peercb, vii. tab, 9. figs. 1-7 (skull). 
Hystrix dorsata, Blainv., Ostéog. G. Hystrix, pl. 8 (skull). 
Cervical vertebre............5. 7 
Dorsal 2nnoraswde si aawey exes 14 
TUM bar cis cnn wena am gens: sews 6 
Sacral: cei anasomaulewaanweds 3 
Gaia alle beset Lael cent ine aie 17 
b. Skeleton. lection. 
ce. Skull: young. From Mr. Yarrell’s Collection. 
*q, Skull. Central America. } From the Zoological Society’s Col- 
Erethizon epixanthus. 
Brandt, Mamm. Exot. p. 55. pl. 9. figs. 1-3 (skull).— Baird, Mamm. 
N. America, p. 569. pl. 55. no. 1263 (teeth), 1859. 
Cervical vertebraee.............. 7 
DGPS ANN 5 een aavcaarsecor wen Brus weasease 14 
TWMDAE .veawde de. Ne Sedna dave 6 
DACA: Giahactace ha lascacmmva des nee eorbeh 3 
Caudal ....... 2... c cee ee eee 17 
a. Skeleton. California. From Mr. Brandt’s Collection, 
SPIGGURUS. 
Teeth :—Incisors = ; Molars =} ;=20. 
The Ontco. Spiggurus insidiosus. 
Hystrix insidiosa, Blainv., Ostéog. G. Hystrix, pl. 3 (skull). 
Cervical vertebre............-. 7 
DGGSal. icc scene ween de wasn 16 
° 
