CLASSIFICATION OF MAMMALS, 629 
Subclass II. Didelphia.—Order Marsupialia—Mammals with a mar- 
supium and bones supporting it. (Macropus, Didelphys.) 
Subclase II. Monodephia.—Placental mammals. 
Super-order I. Ineducabilia.—Brain with a relatively small, 
smooth cerebrum. 
Order 1. Bruta.—Incisors absent; sometimes toothles.. 
(Bradypus.) 
Order 2. Glires—Rodents, incisors large. (Sciurus.) 
Order 3. Insectivora.—Fore limbs often peculiarly adapted 
for burrowing ; molars with conical cusps. (Scalops.) 
Order 4. Chiroptera.—Fore limbs adapted for flight. (Ves- 
pertilio.) 
Super-order IT. Educabilia.— Brain with a relatively large, con- 
voluted ce ebrum. 
Order 5. Cetc-—Cetaceans; fish-like in form, no hind 
limbs. ,Baleena.) 
Order 6. Sirenia.—Fish-like in form, but wits ascending 
rami to the lower jaw; teeth ruminant-like. (Mana- 
tus.) 
Order 7. Proboscidea.—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 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 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 
