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 

 pelvis or hip-bone is much compressed, in order that the hind legs, 

 which are comparatively weak and small,, should not project too 

 much laterally. 



OrderlV. 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 



Fig. 39. 



Skeleton of a Fruit-Bat (Pteropusjubatus). 



d, clavicle ; cv, cervical vertebrae : d, dorsal vertebrae ; fb, fibula ; fm, femur ; 

 h, humerus ; hx, hallux ; I, lumbar vertebrae ; me, metacarpals ; mt, 

 metatarsals ; ph, phalanges ; pv, pelvis ; px, pollex ; r t radius ; s, sacral 

 vertebrae ; sc, scapula; s&, skull; b, tibia; ts, tarsus; u, ulna. 



