424 THE BEAR TRIBE 



many Bear-like features in its organisation. The feet, for instance, 

 were plantigrade and iive-toed. The ulna and the radius are 

 specially compared with the same bones in the Bear tribe. The 

 skull on the other baud is as distinctly Dog-like in form. The 

 molars are large, broad, and crushing, and Bear-like. The largest 

 known species, A. gigantrus, is of about the size of the Brown 

 Bear. Amjjhicyon is a Miocene genus. Eocene and allied to 

 it is Fseudamphicyoti. This genus has, like Amiihicyon, the 

 complete dentition of forty-four teeth. In the Amphicyoninae 

 generally the feet are live -toed, the humerus has an entepi- 

 eondylar foramen and the femur a third trochanter. The upper 

 molars are large. 



The closely allied and American genus Daphaenus has also 

 plantigrade feet, and has in its structure many reminiscences of 

 the Oreodonts. So, too, has the Eocene Uintaci/on. 



CynodesDius is closely allied to Cynodictis. It has ancient 

 features combined with quite modern ones. The skull is 

 described as being Creodont-like, but the dentition is that of the 

 microdont .modern Dogs. In accordance with its age the cerebral 

 convolutions of this Dog are much simpler than in existing Dogs, 

 and the hemispheres do not cover the cerebellum so much. 



The Bear-like Carnivora or Arctoidea. — That division of 

 the Carnivora which is typically represented by the Bears em- 

 braces three recent families, which are united by a number of 

 characters. These Carnivora are always plantigrade or nearly so. 

 They have nearly always iive toes. The claws are not retractile, 

 or at most semi-retractile as in the Panda. In the skull the 

 tympanic bulla is often depressed, and is not so globular and 

 obvious as in the Cats. Its cavity is not divided by a septum. 

 The paroccipital processes are not applied to it. The carnassial 

 tooth is less emphasised in this group than in the Cats. 



These characters, however, have to be used with caution, as 

 they are hardly universally applicable. A fairly typical Arctoid 

 bulla is seen in such a form as Ccrcoleiites. The Ijulla itself is a 

 little more swollen than in Ursus, but it is flattened oft" in the 

 same way towards the honj meatus. The paroccipital processes, 

 slightly developed, are at a distance of 1-inch from the posterior 

 margin of the bulla. In the Eaccoon the bullae are much more 

 swollen, and tlie paroccipital processes are closer to them. In 

 the Marbled Polecat, Patorius sarmaticus, the bullae are fairly 



