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 
all 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 limbs perform no of&ce 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, or Fox-Bat (Pteropus meclius). 
c?, clavicle ; ci?, cervical vertebrae ; d, dorsal vertebrsp ; fh, fibula; fm, femur; 
h, humerus ; hx, great toe, or hallux ; I, lumbar vei tebrse ; mc, metacarpals ; 
mf, metatarsals ; ph, phalanges, or toe-bones ; pv, pelvis ; px^ thumb, or 
pollex : r, radius ; s, sacral vertebrae ; sc, scapula ; sJc, skull ; th, tibia ; 
ts, tarsus ; u, ulna. 
6. A Porpoise, adapted solely for swimming in the water. 
The fore-limbs are converted into flattened paddles, and the 
hind-limbs entirely absent, their function being 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 
