658 



COMPARATIVE ANATOMY 



no placenta. Australia furnishes us with most Marsupialia, such as the 

 kangaroo, wombat, phalangerer, pouched mole, and many other forms, 

 while the opossum is the only example in America. 



Division II. Monodelphia. (Placental Mammals). 



The young are never carried in a pouch, but a true placenta nour- 

 ishes the unborn fetus. 



Scalops acqwificus (common mole) s orer ril t gar ; s (common sl.rnr) 



Fig. 385. Jnsectivora. 

 (After Coucs.) 



The placental animals are divided into the following sections: Un- 

 guiculates, Primates, Ungulates, and Cetacea. 



Section A, Unguiculates. (Clawed animals). 



Order I. Insectivora, such as moles, shrews, and hedgehogs (Fig. 



385). 



Order II. Chiroptera, such as bats (Fig. 386). 



Order III. Carnivora, possess sharp teeth and claws. 



Under this heading come the 

 cat, (Felidae) and dog (Canidae) 

 families, for example, and many 

 others. 



Order IV. Rodentia are the 



gnawing animals. Rabbits, guinea 

 pigs (Cavia), rats, mice, squirrels, 

 etc., come under this heading. 



Order V. Edentata. This name 

 means toothless, but the animals 

 with the exception of the ant-eaters, 

 belonging to this group do possess 

 teeth. Different authors classify 

 the Edentata in various ways. The 

 animals usually coming within this 

 group are sloths, ant-eaters, and 

 armadillos. (Fig. 387.) 

 Fig. 386. Chiroptera. Section B, Primates. (Mam- 



(After Sclater.) als With nails.) 



