Oligocene (White River) Felidce. 221 



tween the external margins of the transverse, processes 

 is 71 mm. ; the measurement from the margin of the 

 anterior articular surfaces to the posterior tip of the 

 transverse process is 45 mm., and the maximum diameter 

 across, the anterior articular surfaces is 43 mm. The 

 maximum vertical diameter is 33 mm. and the thickness 

 of the dorsal arch is 9 mm., including the small spine. 

 This skull is much smaller than that of No. 10050 and yet 

 the atlas exhibits some dimensions even greater. The 

 massive character is maintained throughout the skeleton 

 in so far as it is present. 



The axis is nearly complete except for the posterior 

 tip of the spine, which has been restored. The maximum 

 length is 50 mm. and the length of the centrum is 28 mm., 

 exclusive of the odontoid process. The odontoid is 

 9.5 mm. long and 9 mm. wide in transverse diameter at 

 its junction with the centrum, while its vertical diameter 

 is 6.5 mm. The width across the posterior articular sur- 

 faces is 22.5 mm. and across the anterior articular 

 surfaces, 31 mm. The vertebrarterial canal is triangu- 

 lar, with the right angle nearest the centrum. 



Measurements. 



mm. 



Prosthion to basion 132 



Prosthion to nasion 75 



Basion to nasion 93 



Prosthion to bregma 107 



Basion to bregma 77 



Bizygomatic diameter (est.) 104 



Diameter of post orbital constriction 26 



Bimastoid diameter, max 60 



Palatal length 67 



Posterior palatal breadth 41 



Inferior orbital margin to alveolar margin 24 



Infraorbital foramen to posterior margin of zygomatic 



process of maxilla 26 



Length of mandibular ramus 109.5 



Length of mandibular symphysis 39 



Depth of mandible posterior to P 4 23 



Depth of flange (estimated) 41 



Length of tooth row, C to M 1 , inc 59 



Length of tooth row, P 3 to M 1 , inc 32 



Diastema, C to P 3 13 



Diastema, C to I 3 1 



Superior canine, maximum diameter at alveolus 15.5 



Superior canine, transverse diameter at alveolus 7.5 



Am. Jour. Sci.— Fourth Series, Vol. L, No. 297.— September, 1920. 

 16 



