XIII 



rilYLUM CHORDATA 



4!»5 



^^ 



Fic. 1100.— Rock VTallaby (Petroffale xanthoinni). (After Vogt and Specht.) 



The first and fifth digits of the fore-feet are vestio^ial 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. 



:i?^ 









N^ 



Fig. 1110.— Marsupial SSole ^Sutoryclei typhlops). (From the Camlrklije Natural Eistonj.) 



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

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



