xxv ] CLASSIFICATION 719 



Family 1. Epanorthidae. 



Diprotodontia with all the toes of the hind-foot free 

 from one another and subequal. American. 



Ex. Caenolestes. 

 Family 2. Phascolomyidae. 



Diprotodontia with the toes of the hind-foot united by 

 a web of skin : only one pair of chisel-shaped incisors in 

 upper jaw : limbs subequal. Australian. 



Ex. Phascolomys. 

 Family 3. Phalangeridae. 



Diprotodontia in which the toes of the hind-foot are 

 united by a web of skin, the great toe being well developed, 

 free from the web, and opposable to the rest, the second and 

 third toes very slender : limbs subequal : three incisors on 

 each side of the upper jaw. Australian and Papuan. 



Ex. Phalanger. 

 Family 4. Macropodidae. 



Diprotodontia in which the toes of the hind-foot are 

 united in a web of skin, the second and third toes are slender 

 and the great toe is rudimentary : the fore-limbs very short 

 and suited only for grasping : three incisors on each side 

 of the upper jaw. Australian and Papuan. 



Ex. Macropus, Bettongia, Petrogale. 



Sub-class III. EUTHEBIA. 



Mammalia in which the young are born able to suck and in which 

 there is no pouch. The two vaginae are always completely confluent. 

 The cloaca is divided into an anus and a urino-genital aperture. An 

 allantoic placenta always present and greatly developed. 



Order I. Edentata. 



Eutheria devoid of enamel on the teeth and without median 

 teeth ; the limbs are, as a rule, provided with heavy hook-like 

 claws; uterus simple and globular: placenta dome-shaped. 



Family 1. Bradypodidae. 



Limbs long and the fore-limbs considerably longer than 

 the hind-limbs: muzzle short with few teeth: arboreal in 

 habit. South American. 

 Ex. Bradypus. 



