50 Annals of the Carnegie Museum. 



especially when the transverse diameter of the head of the astragalus 

 is taken into consideration. The fact, however, is, that the head of the 

 astragalus extends laterally, as in the Oxyaenids, and articulates with 

 the cuboid perhaps even to a greater extent than in the recent Kinka- 

 jou. The cuboid is very nearly as high proportionally as in Cer- 

 coleptes and has, as indicated above, a facet for the astragalus on the 

 proximal tibial angle. The facet for the distal end of the calcaneum 

 is oblique to conform to the corresponding facet on the calcaneum 

 described above. There is present a heavy plantar tuberosity which 

 again suggests similarity to Cercoleptes. The cuneiforms are high 

 and narrow, the entocuneiform being of considerable size and has a 

 large facet for Alt. I, indicating that digit to be approximately pro- 

 portionate in size to that in Cercoleptes. The metatarsals are repre- 

 sented only by the heads of II, IV, and V and a portion of the shafts of 



III. 



Measurements. 



Vertical diameter of ramus at My approximately 20 mm. 



Length of molar-premolar dentition approximately 60 



Antero-posterior diameter of P4 11 



Antero-posterior diameter of My n 



Transverse diameter of distal trochlea of humerus 19 



Greater transverse diameter of dorsal end of humerus approximately .... 30 



Greatest length of calcaneum approximately 42 



Greatest height of astragalus 25 



Transverse diameter of trochlea of astragalus 10 



Greatest height of cuboid 19 



Transverse diameter of tarsus distally 24 



The genus and species described above is most closely allied to 



Miacis. That it belongs to the branch of the Cynoid MiacincB 



appears to be quite certain from the remains at hand, but whether or 



not its successors are to be found in any of the known genera from 



later geological formations "will not be known until the discovery of 



more perfect material. The study of the limited material at hand 



suggests that the genus represents an aberrant form, especially when 



the oxyaenid and cercoleptid features of the pes are compared with the 



dentition. 



Genus Prodaph^nus Matthew. 



5. Prodaphaenus (?) robustus sp. nov. (Plate XXXIV, Figs. 3-5). 



Type: Fragments of lower jaws with P:^ My and M2- in place; 



fragments of vertebrae, greater portion of right humerus, and head of 



femur, C. M. No. 3023. 



