444 THE WASATCH EPOCH. 



u. 



f transverse^ »t """"'"' ^'"^*»'' "'-^^ 



Diameters axis <^ i postorinrly 018 



I anteroposterior without odontoid 0.i6 



I. vertical posteriorly Olrf 



J .1 e 1 • ■ < from anterior edeo neural arch Oi'iO 



Length ot nrural spine axis< " 



f from posterior edge neural arch O'iU 



Li'njjtb of centrum of third cervical (below) OiiS 



Length of centrum of I'onrth cervical (below) 022 



Length of cent rum of fifth cervical (below) 022 



Length of centrum of sixth cervical (below) 022 



Length of centrum of seventh cervical (below) 022 



Diameters third cervical centrum in front < ^* ' " 



I transverse Olo 



Diameters seventh cervical centrum in front < "^ „,^, 



< transverse 0105 



Greatest width of third cervical at postzygapophyses 0:J5 



The vertebrarterial canal is relatively of smaller size than in the Ta- 

 pirus terrestris, appropriately to the smaller brain. 



The anterior dorsal vertebrcB are partly concealed in the matrix. They 

 have rather elongate neural spines, narrow in both diameters, and trian- 

 gular in section. The diapophyses are elongate, but shorten posteriorly, so 

 that on the eleventh and twelfth they project very little, especially at the 

 inferior side. They there sustain a large tubercular articular facet, which 

 has tlie long diameter directed upwards and forwards. At the superior 

 base the prominent metapophysis stands erect, the entering angle between 

 the two being excavated into a strong fossa. It is distinct from the external 

 edge of the prezygapophysis, and its summit is truncate, and extended to a 

 little horizontal apex, both anteriorly and posteriorly. The centra of the 

 eleventh and twelfth dorsals are depressed, and their inferior face is regu- 

 larly convex in transverse section. The lateral margins are expanded pos- 

 teriorly, terminating in the cup-shaped capitular articular facets. This 

 lateral prominence is not seen in Tapirus terrestris nor in Hi/racotherium 

 venticolum. The opisthocoelism is well marked, but not so strong as in 

 the cervicals. The anterior articular face of the eleventh is flat above, 

 obliquely truncate at the sides, and wider and convex below. On the four- 

 teenth dorsal the median inferior prominence assumes the form of a rib. 

 On the fifteenth it has become a prominent keel. On this vertebra the neu- 

 ral spine has a wide anteroposterior diameter and its posterior edge slopes 

 forwards. On the fourteenth there is a small tuberosity on the superior 



