MAMMALIA 



355 



The family Leporidae is represented by hares and rabbits. Formula for 

 the teeth: Incisors, „; molars, — , or 28 in all. One pair of upper incisors 

 is much smaller and immediately behind the other. This arrangement of 



-Faces of pocket gophers, showing pouches and incisors: 

 a, Geomys; b, Cratogeomys; c, Thomomys. (Yearbook U. S. Dept. of Agri- 



Fig 

 Geoi 

 culture,' 1909.) 



the incisors has iii\cii ris(> to the term DupUcidenta'ta. The soles are furred, 

 thetail short ami i(<ur\cd, the eyes large, and the ears long. ThehindHmbs 

 (Fig. 289) are longer llian the fore limbs (Fig. 290), and they "run" by 



Fig. 289. — Posterior limb of Jack-rabbit. (Mounted by students.) 



prodigious leaps. Genus Lipus cont; 

 common forms in the Ihiitod States ai 

 the marsh hare (L. palustrit;); the watei 



ns thirty or forty species. Our 

 : tlie "cotton-tail" (L. sylvaticus); 

 rabbit (L. aqualicus), also a south- 



