360 THE HIND FOOT OR PES. [cti. xix. 



the others gradually diminish to the fifth. The ends of the 

 toes are turned outwards and backwards in the ordinary 

 position of the animal. 



The ungual phalanges of both extremities in the Mono- 

 tremata have a deep median groove, near the base of the 

 under surface, leading at its distal extremity into a foramen. 



