147 



lobed, while the true molars consist of two lobes with a triangular 

 section. The masseteric fossa of the mandible has a perforation 

 and a deep pit, while the condyle is convex, prominent, and sepa- 

 rated by a deep notch from the coronoid process. The limbs are of 



Fig. 26. 



Phascolomys wombat. Mandibular and palatal dentition, reduced, and single 

 molar of the natural size ; from Tasmania. 



equal length ; the humerus is very stout, and has an entepicondylar 

 foramen; there is a well-developed olecranon to the ulna; the 

 manus has five complete digits, but the hallux of the pes is imper- 

 fect, and the second, third, and fourth digits are of nearly equal 

 size and partly syndactylous. 



Genus PHASCOLOMYS, Geoffrey 1 . 



The upper incisors are not greatly wider than the lower, are 

 either subquadrangular or oval in section, and their biting-surfaces 

 are not worn very obliquely; in the lower incisors the biting- 

 surfaces are comparatively short. 



1 Ann. d. Museum, vol. ii. p. 365 (1803). 



