333 



crown of the permanent premolar is exposed in the substance of the 

 jaw. 



From one of the caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



1537- A fragment of the right superior maxillary bone of the Cave Potoroo 

 {Hypsiprymnus spelceus, Owen), with the permanent premolar and two 

 of the anterior molars in place. A scalpriform incisor of a murine Ro- 

 dent animal is cemented to the above fragment by the same piece of 

 ferruginous breccia. 



From one of the caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



1538. A portion of the left ramus of the lower jaw of a young Cave Potoroo 



(Hypsiprymnus speleeus). The deciduous premolar and the three follow- 

 ing molar teeth are in place : the crown of the permanent premolar is 

 exposed in the substance of the jaw below the deciduous one ; the base 

 of the socket of the large procumbent incisor is exposed at the fore part 

 of the fractured jaw. 



From one of the bone-caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



1539. A portion of the left ramus of the lower jaw of a Cave Potoroo {Hypsi- 

 prymnus spelceus), with two molar teeth in situ. 



From one of the caves in Wellington Valley, Australia. 



Presented by Count Strzelecki. 



Genus Phascolomys. 



1540. The right superior incisor of Mitchell's Wombat (Phascolo?nys Mitchelli. 



Owen) : it is thicker transversely, and flatter on the inner enamelled 

 side than in the existing- Wombat : the longitudinal groove on the con- 

 cave unenamelled side of the tooth is shallower than in the smaller 

 existing species. 



From one of the caves in Wellington Valley, Australia. 



Presented by Lieut. -Col. Sir T. L. Mitchell, C.B. 



