1918] Stock: The Pleistocene Fauna of Hawver Cave 495 



No. 19860— 



M- or greatest anteroposterior diameter 12.9 



M- or M 1 , greatest transverse diameter 16.8 



No. 10634— 



M 2 , greatest anteroposterior diameter 11.9 



M-, greatest transverse diameter 16.4 



No. 21473— 



M-, greatest anteroposterior diameter 7.5 



M 5 , greatest transverse diameter 16.2 



No. 19867— 



Mj, greatest anteroposterior diameter 14.3 



M;, greatest transverse diameter 16.2 



With the exception of the cervical region, the vertebral column is 

 represented by separate vertebrae in various stages of preservation. 

 Only in the caudal series are several vertebrae directly associated. 



No. 21476 (figs. 16a, 16b) represents the last sacral or first caudal 

 vertebra, presumably of Nothr other iurn. Unfortunately this speci- 

 men is very badly damaged, for approximately one-half only remains 

 for identification. The centrum, in contrast to that of caudal ver- 

 tebrae from Hawver Cave, is very broad and not of great depth. It 

 is not possible to determine whether the centrum bore chevron-facets 

 on the ventral surface, but it is presumed that these were absent. 

 The transverse process is much expanded, with ventral surface 

 decidedly concave and directed well forward. A broad groove 

 extending from the neural canal to the ventral or posterior border 

 lies adjacent to the posterior face of the centrum. This groove does 

 not communicate with another canal coming from between the chevron 

 facets as in caudal vertebrae of Nothrothcrium. The neural arch 

 encloses a spacious canal. The prezygapophysis is noticeably slender 

 and does not possess an articulating facet on the inner face. On the 

 inner posterior side of the prezygapophysis is a distinct pit. 



A vertebra (figs. 17a-, 17b, 17c) considered tentatively as the second 

 of this series is comparatively well preserved. In this specimen the 

 centrum is broad with dorsal border of anterior face straight. The 

 posterior epiphysis is separated by a groove from the base of the 

 neural arch and the transverse processes. The posterior face of the 

 centrum is concave through the middle. The dorsal surface of the 

 centrum is perforated by several large nutritive foramina. Four 

 facets, articulating with the chevron bones, are situated on the ventral 

 surface (fig. 17c), one facet at each lateral angle. The anterior and 

 posterior pair of chevron facets are separated by a deep groove which 



