OSTEOLOGY OF E. DOLLOVIANUS, COPE 



23 



Fig. 18. — The fifth, sixth, and seventh presacrals. 

 natural size. 



side of the centrum. The vertebrae are rapidly shortening again 

 and the articular faces becoming relatively larger. 



Length along the bottom line of the centrum - - - 0.026'" 



In the twenty-seventli, fifth presacral (Fig. 18), the rib seems 



to have completely lost its connection with the intercen- 



trum. The tuber- 

 culum is attached 

 to the downwardly 

 inclined face of a 

 very short trans- 

 verse process and 

 the capitulum to 

 the edge of the 

 centrum. The 

 capitulum is grad- 

 ually shortening. 

 The neural spine is 

 rather thin, but 

 has considerable antero-posterior extent. The anterior and pos- 

 terior zygapoyhyses are nearly horizontal, but the articular faces 

 are somewhat curved. 



Length of the bottom line of the centrum . . . . 0.023"" 

 The remaining presacrals 

 show a considerable simi- 

 larity. The twejity- eighth, 

 fourth presacral (Fig. 19), 

 has the broken base of the 

 rib still attached and show 

 that both tuberculum and 

 capitulum are still present. 

 In the twenty -7iinth, third 

 presacral (Fig. 19), the capit- 

 ulum is much reduced and 

 the rib stands out almost 

 straight from the upper portion of the centrum. 



In the thirtieth, second presacral (Fig. 19), there is no trace 

 of a capitulum, and the rib is a short stubby process. 



Fig. 19. — The second, third, and fourth presa- 

 crals. % natural size. 



