XIII 



PHYLUM CHOKDATA 



495 



Fio. 1109. -Rock Wallaby (Petrogale xanthopus). (After Vogt and Specht.) 



The first and fifth digits of the fore-feet are vestigial or absent, the 

 remaining three nearly equally developed. In the hind-foot the 

 fourth toe is much longer and stouter than the others, while the 

 second and third are small and slender and united together by a 

 web of skin, and the first is vestigial or absent. The marsupium 

 .has its opening directed backwards. 



FIG. 1110. Marsupial Mole (Notoryctes typhlops). (From the Cambridge Natural History.) 



Notoryctes,the Marsupial Mole (Fig. 1110), is a small, burrowing 

 Marsupial, with short and powerful limbs, each with five toes, 



