CLASSIFICATION OF MAMMALS. 629 



Subclass II. Didelphia. Order Marsupialia. Mammals with a mar- 

 supium and bones supporting it. (Macropus, Didelphys.) 



Subclass III. Monodephia.Pl&cent&l mammals. 



Super-order I. Ineducabilia. Brain with a relatively small 

 smooth cerebrum. 



Order 1. Bruta. Incisors absent; sometimes toothless. 

 (Bradypus.) 



Order 2. Olires. Rodents, incisors large. (Sciurus.) 



Order 3. Insectivora. Fore limbs of ten peculiarly adapted 

 for burrowing ; molars with conical cusps. (Scalops.) 



Order 4. Chiroptera. Fore limbs adapted for flight. (Ves-> 

 pertilio.) 



Super-order II. Ediicabilia.- Brain with a relatively large, con- 

 voluted cerebrum. 



Order 5. Cete. Cetaceans; fish-like in form, no hind 

 limbs, ^alsena.) 



Order 6. Sirenia. Fish-like in form, but wit> ascending- 

 rami to the lower jaw ; teeth ruminant-like. (Mana- 

 tus.) 



Order 7. Proboscidea. Snout prolonged into a proboscis. 

 (Elephas.) 



Order 8. Hyracoidea.Loug curved incisors; feet with 

 pads ; toes encased in hoofs. (Hyrax.) 



Order 9. Toxodontia. Extinct forms, with well developed 

 incisors. (Toxodon.) 



Order 10. Ungulata. Ungulates ; toes encased in hoofs. 



(Equus, Bos.) 



Order 11. Carnivora. Teeth pointed; claws large. (Felis, 

 * Canis.) 



Order 12. Primates. Brain with cerebrum nearly or quite 

 covering the cerebellum ; nails usually present; body 

 quadrupedal, quadrumanous, or erect and bimanous. 

 (Cebus, Gorilla, Homo.) 



Laboratory For*. All the craniate vertebrates may be dissected in 

 the same general manner, either under water in pans, or, if large, upon 

 the dissecting table. The necessary tools are a scalpel, forceps, scis- 

 sors and tenaculum or hook for suspending the specimens or portions 



