22 



CENTRAL HALL. 



from the boughs of the trees among which it passes its entire 

 existence. 



4. The Baboon serves as an example of an animal walking on 

 aU four limbs in the "plantigrade" position, i.e., with the whole of 

 the palms of the hands and soles of the feet applied to the ground. 



5. A small species of Antelope shows the characteristic form 

 of a running animal, in which the Umbs perform no office but 

 that of supporting the body on the ground. It stands on the 

 tips of the toes of its elongated slender feet. 



Fig. 7. — The Skeleton of a Flying-Fox, ok Fox-Bat {Fteropus medius). 



oZ, clavicle; cu, cervical vertebrsB ; d, dorsal vertebrsp; /6, fibula; fm, femur; 

 ft, humerus ; hx, great toe, or hallux ; I, lumbar vertebrse ; mc, metacarpals ; 

 mt, metatarsals ; ph, phalanges, or toe-bones ; pv, pelvis ; px, thumb, or 

 poUex; r, radius; s, sacral vertebrse; «c, scapula; s/t, skull; t6, tibia ; 

 is, tarsus ; u, ulna. 



6. A Porpoise, adapted solely for swimming in the water. 

 The fore-limbs are converted into flattened paddles, and the 

 tund-limbs entirely absent, their function beiug performed 

 by the tail. The rudimentary pelvic bones are preserved. 



The rest of the case is occupied by details of the skull in 

 some of its principal modifications. At the top are diagrams 



