PLATE I. 



m.e,. 



jo^.a.e. 



Portions of Finger Skeletons of Bats (diagrammatic), enlarged 

 TO show Stages in Ossification of the Joints. 



m. Metacarpal;///!, phalanx i;ph2, phalanx 2; ine, metacarpal epiphysis; p/i I e. first 

 phalangeal epiphysis ; p/i 2 />, second phalangeal epiphysis. 



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



B. Older but still immature specimen, in which ossihcation, although advanced, is incom- 

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



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



