MURIDiE. — CITRY80MT8. 223 



Tho Pouched Gopher. Geomys bursarius. 



Baird, Mamm. N. America, p. 372. pi. 50. fig. 2 (skull), 1859. 

 Ascomys canadensis, Srhreb., Saugth. iii. p. 383, 1843; Abb.. K. Baier. 

 Acad. Miinchen, xxii. p. 327 (skeleton), 1846. 



The Short-headed Gopher. Geomys breviceps. 

 Baird, Mamm. N. America, p. 37. pi. 52. fig. 2 (skull), 1859. 



THOMOMYS. 



Teeth : — Incisors 



The California^ Gopher. Tbomomys bulbivorus. 



Baird, Mamm. N. America, p. 389. pi. 50. fig. 8 (skull), pi. 52. fig. 1 

 (skull). — Brandt, Mem. Acad. St. Petersb. vii. pi. 5a. figs. 1-9 (skull 

 and dentition). 



*a. Skull. California. 



The Sonora Gopher. Thomomys umbrinus. 



Baird, Mamm. N. America, p. 399. pi. 83. fig. 5 (skull), 1859. 

 Geomys umbrinus, Richardson, Cbarlesworth's Mag. Nat. Hist. 1839, 

 p. 596. fig. 71 (skull). 



SACCOPHORUS. 

 Teeth :— Incisors j=j ; Molars |=| ; = 16. 



The Tugan. Saccophorus mexicanus. 



Ascomys mexicanus, Schreb., Saugth. pi. 239 b (dentition). — Brandt, 

 Mem. Acad. St. Pe'tersb. vii. pi. 5 a. figs. 10-12 (dentition). 



a. Skull. Mexico. 



The Qhachil. Saccophorus quachil. 



Cervical vertebrae 7 



Dorsal 12 



Lumbar 7 



Sacral 5 



Caudal 16 



a. Skeleton. Mexico. From M. Salle's Collection. 



CHRYSOMYS. 



The Golden Mole Rat. Chrysomys splendens. 



Bathvergus splendens, BMppett, Faun. Abyss, tnf. 12 (skull), 1835-40. 

 — Waterhouse, Mag. Nat. Hist. viii. p. 84. pi. 2. fig. 3 (skull), 1842. 



