442 



Thorpe — Some Tertiary Camivora in 



contact with P 1 . From the external incisor the incisive 

 alveoli show a progressive rednction in transverse diam- 

 eter. M 2 is considerably rednced in size. The parastyle 

 on the upper carnassial is well developed. 



The large infra-orbital foramen lies above the posterior 

 part of P 3 . The anterior zygomatic pedicle is very heavy, 

 measuring 41 mm. from the infra-orbital border to the 

 alveolar parapet, directly beneath. 



In some respects this new mutation is similar to A. 

 platyrhinus Barbour and Cook, but the former differs in 



Y. P. M. 



Fig. 11. — Mlurodon taxoides magnus, mut. nov. Holotype. X V^- A, 

 occlusal view of inferior dentition; B, external view of right ramus. 



the following respects: (1) somewhat larger, (2) no 

 crowding of the premolars except that there is no 

 diastema between the first and the canine, (3) larger 

 canine, (4) carnassial over one fifth greater in transverse 

 diameter and M 1 smaller and of relatively less transverse 

 diameter, and in still others, the number of which would 

 undoubtedly be increased if we had more of the skull of 

 the Yale specimen or the mandible of the Nebraska indi- 

 vidual. 



