CLASSIFICATION OF MAMMALS. 629 



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

 Bupium and bonea supporting it. (Macropus, Didelphya.) 



Subclass III. Monodephia. — Placental mammals. 



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

 smooth cerebrum. 



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

 (Bradypus.) 



Order 2. QUres. — Rodents, incisors large. (Soiurus.) 



Order 3. Insectivora. — Fore limbs often peculiarly adapted 

 for burrowing ; molars with conical cusp.>f. (Scalops.) 



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

 pertilib.) 



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

 voluted cerebrum. 



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

 limbs. (Balaena.) 



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

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

 tus.) 



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

 (Elephas.) 



Order 8. Eyracoidea. — 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 lioofs. 

 (Equus, Bos.) 



Order 11. Car»wrff.— Teeth pointed; claws large. (Felis, 

 Canis.) 



Order 13. Pnma«e«.— Brain with cerebrum nearly or quite 

 covering the cerebellum ; nails usually present ; body 

 quadrupedal, quadrumanous, or erect and bimanous. 

 (Cebus, Gorilla, Homo.) 



Laboratory Work.— AW 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 liook for suspending the specimens or portions 



