CLASSIFIGATION OF MAMMALS. 629 



Subclass II. Bidelphia. — Order Marsupialia. — Mammals with a mar- 

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



Subclass III. Monodephia. — Placental mammals. 



Super-order I. Inedueabilia. — Brain with, a relatively small, 

 smooth cerebrum. 



Order 1. Bruta. — Incisors absent ; sometimes toothless. 

 (Bradypus.) 



Orders. Glires. — Rodents, incisors large. (Sciurus.) 



Order 3. Insectitiora. — Fore limbs often peculiarly adapted 

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



Order 4. GMroptera. — Fore limbs adapted for flight. (Ves- 

 pertilio.) 



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

 voluted cerebrum. 



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

 limbs. (Balaena.) 



Order 6. Sirenia. — Fish-like in form, but with ascending 

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

 tus.) 



Order 7. Froboscidea. — Snout prolonged into a proboscis. 

 (Elephas.) 



Order 8. Hyracoidea. — Long 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 hoofa. 

 (Equus, Bos.) 



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

 Canis.) 



Order 13. Primates. — Brain with cerebrum nearly or quite 

 covering the cerebellum ; nails usually present; body 

 quadrupedal, quadrumanous, or erect and bimanous. 

 (Cebus, Gorilla, Homo.) 



Laboratory Work. — 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 



