4 Journal of the Mitchell Society. [March 



after birth. Order I. Marsupialia. (Opossums, 

 aa. Females without external pouch for car 



b. Fore limbs modified to serve as wings. Order II. 



Cheiroptera 

 bb. Fore limbs not modified to serve a 



c. Toes provided with hoofs. Order III. Ungulata. 



(Deer, Cattle, et 

 cc. Toes not furnished with hoofs, but with claws o: 

 some sort. 

 d. Front teeth chisel shaped a 



teeth by a wide spac • Order IV. C 

 (Squirrel . Mice, Rabbits 



dd. Front teeth not chisc - ped, tooth row nearly 

 or quite continuous. 

 e. Brain large, well developed. I 

 large, e 

 greatly elongated. « >rd r V. F 



2 fksh eaters, 

 Be;.r-. .: 

 ee. Brain small, not hig d. In oui 



species size smal mall or 



mentary, muzzle elon 

 Insectivora. ^Moles and Shr. 



ORDER I. MARSUPIALIA. 



FAMILY DIDELPHIDAE (THE OPOSSUM 



The members of this family, which is the only one re 

 sented in America, have 50 teeth, a prehensile tail, an . 

 hind feet w T ith five toes each, the outer one of which is 

 less and thumb-like. Our only genus is. 



GENUS DIDELPHIS. L. 



1. Didelp/usz'irgiuiana, Kerr. Common Opossum. Blackish 



