PETERSON: A REVISION OF THE ENTELODONTIDAl 95 
of the base of the diapophyses, which are scarcely indicated in the Princeton speci- 
men. The diapophyses are fully as well developed as in Archwxotheriwm, and the 
inferior keel is sharper than in the latter genus. 
Fifth Cervical. — As in the preceding vertebra, the neural spine is lost. ‘The 
centrum is relatively much more opisthoccelous, and the inferior lamella is slightly 
less developed and less everted than in Archezotheriwm. The inferior keel is sharp 
Fic 40. Posterior and Lateral Views of Fifth Cer- Fia. 41. Inferior View of 
vical of D. hollandi Peterson. 4 nat. size. Fifth Cervical of D. hollandi 
Peterson. } nat. size. 
and continues to the postero-inferior border of the centrum, where a blunt tubercle 
is located on either side of the median keel. In Archxotheriwm the keel is heavier 
and it terminates posteriorly in a heavy rugose mass, which indicates a relatively 
Fic. 42. Posterior (1), Lateral (2), and Anterior (3) Views of the Sixth Cervical of D. holiandi Peterson. 
‘| A 
} nat. size. 
heavier attachment for muscles than in the Miocene genus. In the latter genus the 
diapophyses present a more trihedral section and the ends are less expanded than 
In Archxotheriwm. 
