80 
OSTEOLOGICAL GALLERY. 
humerus (h) is enormously large, strong, and ridged, to afford inser- 
tion for the powerful digging-muscles ; the scapula {sc) is long and 
straight, and the fore foot, in addition to its proper complement of 
five toes with strong nails, possesses a much enlarged os falciforme 
(/), adding to the breadth and strength of the palmar surface. The 
])elvis or hip-bone is much compressed, in order that the hind legs, 
which are comparatively weak and small, should not project too 
much laterally. 
Order IV. CHIROPTERA. 
[Case 8.] The Chiroptera, or Bats, are characterized by the possession of 
the power of flight; for this purpose the whole fore limbs are 
enormously elongated and strengthened, the finger-bones being 
especially long (fig. 39). The forearm is formed almost entirely by 
Skeleton of a Fruit-Bat {nero}ms juhatus). 
cl, clavicle ; cv, cervical vertehrre : d, dorsal vertebrae ; ^fb, fibula ; fm, femur ; 
h, humerus; Ilv, hallux; I, lumbar vertebrae; me, metacarpals ; mf, 
metatarsals ; p//, phalanges ; pv, pelvis ; p.r, pollex ; r, radius ; s, sacral 
vertebrm ; sc, scapula; sk, skull; b, tibia; is, tarsus; u, ulna. 
