MAMMALIA. 683 



of second toe largest of all. Tail short. (Dent. form. OWEN, 

 . i_i i_i 3-3 



Sp. Bathyergus maritimus ILLIG., Mus maritimus GMEL., Mus suillus SCHREB., 

 BUFF. Suppl. vi. fig. 38 (fig. of ALLEMAND from the Dutch edit, of BUF- 

 FON), SCHREB. Tab. 204 B, GUER. Iconogr., Mamm. PI. 38, fig. 3, the 

 skeleton figured in PANDER und D'ALTON Vergl. Osteolog., Heft vi. Tab. 

 3 ; the sand-mole; this animal lives in sandy countries and on the sand- 

 hills at the Cape of Good Hope ; it feeds on roots, like the other species of 

 this family. 



Ascomys LICHTENST., Saccostomus KUHL, Pseudostoma SAY, 



4 4 

 Orycteromys or Oryctomys BLAINV. Molar teeth -. j , destitute 



of roots, subcylindrical. Ears very short, rounded. Eyes small. 

 Bnccal pouches large, deep (when empty received in a cutaneous 

 fold, opening downwards by a long fissure at the inferior margin of 

 jaw). Fore feet fossorial, with middle three claws long, incurved, 

 the third longest of all. Tail short. 



a) With upper incisors deeply indented in the middle by a longitudinal 

 groove. 



Sp. Ascomys canadensis LICHTENST., Mus bursarius SHAW, Geomys bursarius 

 RICHARDSON, SHAW Transact, of the Linn. Soc. v. p. 227, Tab. vm. 

 (copied in DESMAREST Encycl. meth., Mamm. PL Suppl. x. fig. 4); LICH- 

 TENSTEIN Ueber die dmsere Backentasche der Nagethiere, Abhandl. der 

 Alcad. der Wissensch. zu Berlin, vn. 1825, s. 13 20, Tab. 2; red-brown; 

 trunk full 8", tail 3" long; this animal lives in Canada. (In SHAW'S 

 figure the buccal pouches are inverted, hanging down on each side of the 

 head). Ascomys mexicanus LICHTENST.; shining dark-brown. 



b) With upper incisors marked by a very thin lateral groove or quite 

 smooth. Thomomys MAXIM. 



Sp. Ascomys bulbivorus, Diplostoma bulbivorum RICHARDS. Faun. bor. Arner., 

 Mamm. PI. 18 B, copied in KRAUSS 1.1. Tab. 20, fig. 7; Ascomys rufescens 

 WAGN., Thomomys rufescens MAXIM. NEUW., Oryctomys Bottte ETDOUX et 

 GERVAIS (GUERIN Mag. de Zool. 1836, Mamm. PI. 21, fig. 4, fig. of teeth), 

 in WAGNER'S opinion. 



Haplodori WAGL., WAGX., Aplodontia BICHARDSON. 



M * ' jc 



Sp. Haplodon leporinus, Aplodontia leporina RICHARDS. Zool. Journ. 1829, 

 P- 335> Faun, bor Amer. i. p. 211, Tab. 18 c, figs. 7 14, Arctomys rufa 

 HARLAN, Fauna Americana, Philadelphia, 1825, p. 208; hab. the west of 

 North America near the river Columbia. The animal unknown to me, 



