MAMMALS. 13 



i Anterior and posterior limbs and pelvis well developed ; 

 femur and humerus not exserted beyond the common 

 integuments of the body. 



a. Feet with developed claws ; canines specialized ; molars, 



one or more, sectorial, adapted for cutting; incisors 



■f; chiefly carnivorous. . . Oaknitoba, A. 



aa. Feet with hoofs; molars mostly with grinding surfaces; 



incisors various; no tusks; developed toes, four or 



fewer ; chiefly herbivorous. . . Ungtilata, B. 



f f Brain with a relatively small cerebrum, leaving behind much 



of the cerebellum exposed, and, in front, much of the 



olfactory lobes. (Ineducabilia.) 



6. Canine teeth present, in some form ; incisors not f- nor f . 

 c. Anterior limbs adapted for flight; ulna and radius 

 united; bones of hand and fingers much elon- 

 gated, supporting a thin, leathery skin, extending 

 along sides of body to the posterior limbs; 

 mammae pectoral. . . Chiropteka, C. 

 ee. Limbs all adapted for walking ; ulna and radius not 

 united; hand normal; mammse usually abdomi- 

 nal Insectivoka, D. 



6&. No canine teeth; incisors f, rarely f, chisel shaped; 

 limbs adapted for walking. . Rodentia, E. 



** Young bom when of very small size and incomplete develop- 

 ment, never connected by a placenta to the mother; corpus 

 callosum rudimentary. (DmBtPHiA.) . MABStrpiAiiiA, F. 



A. FAMILIES OF CARNIVORA. 

 * Intestinal canal provided with a ccECum ; feet digitigrade ; toes 



t Teeth 38 to 30; head broad; snout short; claws sharp, 



retractile Fblid^, 1. 



ff Teeth 38 to 46; snout elongated; claws bluntish, non- 

 retractile Canid^, 3. 



** Intestinal canal without a coecum ; feet plantigrade, or, if not, 

 toes 5-5. 



