Smithsonian Report. 1936. Pycraft 



Plate l 



Progressive Stages in the Molding of the limbs, in Response to Intensive 



Climbing habits. 



.1, Grey cuscus (Trk'iosurus maculatus); B, koala {Pliascolarctos cinereua); C, awantibo {Arctoctbus 

 calabar ensis); D, three-toed sloth {Brady pus tridactylus). 



