174 MURIDE.—-PEROGNATHUS. 
SIGMODON. 
Teeth :—Incisors <1; Molars *2;=16. 
1- =i 3 3-3? 
The Stemopon. Sigmodon hispidum. 
a. Skull. From the. Zoological Society’s Collection. 
*b. Skull. 
The Texas Corron Rat. Sigmodon berlandieri. 
Baird, Mamm. N. America, p. 504. pl. 52. figs. 6, 7 (skull), pl. 84. 
fig. '3 (skull), 1859. 
Sigmodon ——? 
*q, Skull. 
LASIUROMYS. 
Lasiuromys villosus. 
E. Deville, Rev. et Mag. de Zool. 1852, iv. p. 557. pl. 16. figs. 5 & 5a 
teeth).—Castelnau, Amérique du Sud, p. 109. pl. 17. figs. 2, 8, 4 
skull and dentition). 
PHLZOMYS. 
Teeth :—Incisors = —; Molars 2 os = ;=16 
The Putmomys. Phleomys cumingii. 
Vaillant, Voy. de la Bonite, pl. figs. 3-5 (skull). 
a. Skull. Manilla. From the Zoological Society’s Collection. 
HETEROMYS. 
Teeth :—Incisors =; Molars +4 ;=20. 
4-4? 
The Sprny-poucuEep Rar. Heteromys anomalus. 
a, Skull. §. America. Presented by J. D. Sowerby, Esq. 
PEROGNATHUS. 
Teeth :—Incisors >; Molars #*;=20. 
Perognathus monticola. 
Baird, Mamm. N. America, p. 422. pl. 51. fig. 8 (skull), 1859. 
*a, *b. Skulls. Honduras. From Mr. Dyson’s Collection. 
Perognathus hispidus. 
Baird, Mamm. N. America, p. 421. pl. 51. fig. 3 (skull), 1859. 
