PETERSON: THE AMERICAN DICERATHERES. 



437 



behind. The superior, or transverse process proper, is located well up on the 

 centrum; it is trihedral in cross-section, rather short, and projects strongly back- 

 wards. The neural spine of this vertebra is quite high, attenuated, of great antero- 

 posterior diameter, and terminates rather abruptly. 



Fig. 19. Diccratherium cooki Peter.son. No. 2499, Coll. Carnegie Museum. Lateral and posterior views 



of fourth cervical. X i. 



The neural spine of the seventh cervical is quite high and generally terminates 

 in a sharp point. The transverse process is abruptly reduced and there is no 

 vertebrarterial canal. 



Fig. 20. Diccrntherium cooki Peterson. No. 2499, Coll. Carnegie Museum. Lateral and posterior views 



of sixth cervical. X i. 



Dorsal Vertebrce (Figs. 22-24). We are not yet in a position to positively 

 state the number of vertebrae in the dorsal series. In the skeletons articulated 

 and those assembled for articulation and sent to other institutions by the Carnegie 

 Museum there have been inserted nineteen. This number is thought to be ap- 



