174 MURID-ffi. PEROGNATHUS. 



SIGMODON. 

 Teeth :— Incisors \± ; Molars |^| ; = lfi. 



The Sigmodon. Sigmodon hispidum. 



a. Skull. From the Zoological Society's Collection. 

 *b. Skull. 



The Texas Cotton Rat. Sigmodon berlandieri. 

 erica, p. 501 



Sigmodon 



Baird, Mamin. N. America, p. 504. pi. 62. figs. 6, 7 (skull), pi. 84. 

 fig. 3 (skull), 1859. 



*«. Skull. 



LASIUROMYS. 

 Lasiuromys villosus. 



E. Deville, Rev. et Mag. de Zool. 1852, iv. p. 557. pi. 16. figs. 5 & 5 a 

 (teeth). — Castelnau, Amenque du Sud, p. 109. pi. 17. figs. 2, 3, 4 

 (skull and dentition). 



PHL.E0MYS. 



Teeth :— Incisors '4; Molars ^;=16. 



The Phl^ohys. Phlaeomys cxuningii. 



Vaillant, Voy. de la Bonite, pi. figs. 3-5 (skull). 

 a. Skull. Manilla. From the Zoological Society's Collection. 



HETEROMYS. 



Teeth :— Incisors \~ ; Molars £± ;=20. 



The Spiny-pouched Rat. Heteromys anomalus. 

 a. Skull. S. America. Presented by J. D. Sowerby, Esq. 



PEROGNATHUS. 



Teeth :— Incisors £} ; Molars ^ ;=20. 



Perognathus monticola. 



Baird, Mamm. N. America, p. 422. pi. 51. fig. 3 (skull), 1859. 

 *«, *b. Skulls. Honduras. From Mr. Dyson's Collection. 



Perognathus hispidus. 

 Baird, Mamm. N. America, p. 421. pi. 51. fig. 3 (skull), 1859. 



