212 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXX. 



the Carnivora, and distinguishing them sharply from either marsupials 

 or insectivores. In practically all modern carnivora the arrangement 

 of the basicranial bones and foramina is obscured or modified by the 



\ 



development of tympanic bulhie. In Sinopa the bulla^ arc absent, giv- 

 ing a singularly primitive appearance to this part; they were either 

 notossihed at all or were loosel}' attached to the skull. The bulla? are 

 not developed in marsupials nor in most Insectivora, but in both these 



