EXPLANATION OF THE PLATES. 741 



Page. 



. 2 Arvicola montana, Peale. No. 1271. Lost river, California. In alcohol.., 528 

 a 8 ide view of head ; b front view of head ; c front face of upper in 

 cisors ; d under surface of left fore foot ; e under surface of left hind 

 foot, (twice nat. size.) 



Fig. 3 Perognatusflavus, Baird. Missouri river, ahove Yellow Stone. In alcohol... 423 

 a side view of head ; b under surface of head, with jaws closed ; c under 

 surface of head, with jaws open, showing the roof of the palate, with its 

 transverse ridges ; d under surface of left fore foot ; e under surface of 

 left hind foot. 



Fig. 4 Neotoma occidentalis, Cooper. No. 968. Astoria, 0. T. Dried skin softened 496 

 a side of left ear ; b under side of left fore foot ; c side view of toe of 

 left fore foot ; d under surface of left hind foot ; e side view of toe of 

 left hind foot. 



Fig. 5 Jaculus hudsonius. Jumping mouse Carlisle, Pa. In alcohol ; twice mag 

 nified 430 



a side of left ear ; b under surface of muzzle ; c under side of left fore 

 foot ; d under side of left hind foot. 



PLATE XXII. 



Fig. 1 Geomys bursarius. Gopher. St. Louis. In alcohol 372 



a side view of head ; b under surface of head, with the jaws closed, 

 showing the pouches ; c under surface of head, with the jaws open, 

 showing the tongue, the hairy ante-chamber of the mouth, and the 

 naked space behind the incisors ; d under surface of head, with lower 

 jaw removed, showing the belt of hair across the palate, the naked space 

 between this and the incisors, the naked portion of the palate, with its 

 ridges, and the upper molars ; e under surface of the left foot ; / under 

 view of middle claw of left fore foot ; g side view of the same ; h under 

 surface of left hind foot. 

 Fig. 2fThomomys borealis. No. 1260. Canoe creek, Cal. In alcohol 396 



a side view of head ; b under surface of head ; c under surface of left fore 

 foot ; d side view of its middle claw ; e under surface of left hind foot. 

 Fig. 3 Geomys pinetis, Baf. Gopher. Florida. Dried skin softened 380 



a under surface of left fore foot ; b side view of its middle claw ; c 

 under view of its middle claw ; d under view of left hind foot ; e front 

 view of upper incisors, showing the single median groove. 

 Fig. 4 Geomys hispidus, Lee. Mexico. Dried skin softened 386 



a under surface of left fore foot ; b side view of its middle claw ; c 

 under surface of the same ; d under surface of left hind foot. 



PLATE XXIII. 



Fig, 1- Cervus macrotis, Say. Mule deer, female. No. 1200. Upper Des Chutes, 



Oregon 656 



. 4 



a side view, and b under surface of left fore foot ; c side view, and c? 

 under surface of hind foot. 



