PLATE I. 



m.e. 



Tsh.i.e. 



f,k 



■z.e.-' 



Portions of Finger Skeletons of Bats (diagrammatic), enlarged 

 TO SHOW Stages in Ossification of the Joints. 



m, Metacarpal ; /)/j I, phalanx i;p/t2, phalanx 2; me, metacarpal epiphysis; fiiie. first 

 phalangeal epiphysis ; phle^ second phalangeal epiphysis. 



A. Young specimen with epiphyses quite distinct from phalanges and metacarpal. 



B. Older but still immature specimen, in which ossification, although advanced. Is incom- 

 plete, and the outHne of all the bones composing each joint is visible. 



C. Fully mature specimen, in which all trace of the epiphyses has been lost. 



