194 ANIMAL ACTIVITIES. 
commonly large and when deposited for hatching out- 
side of the body are covered with a limy shell. A 
CLANICLE/ 
Fic. 153.—Brain of 
Frog. O/, olfactory 
lobes; CH, cerebral 
hemispheres ; OpZ, 
optic lobes; C7, 
cerebellum; 7/0, 
medulla oblongata, 
Fic. 152.—A Man’s Skeleton. 
peculiarity of the skull of Reptiles is the presence of 
the quadrate bone, a characteristic shared also by 
birds. 
