ISO E. C. CASE 



lumbar spines and is inclined sharply . to the rear, leaving a 

 considerable space between it and the last lumbar. The second 

 sacral has a smaller and more slender spine than the first, but there 

 is the same inclination to the rear. The neural arch, seen from 

 above, is much narrower, and the sides are not rounded out into the 

 almost hemispherical form characteristic of the presacrals. In fact, 

 the sides of the neural arch are almost concave. The centra are 

 abruptly longer than the last lumbar, and the bases of the centra 

 are closely united. There is no intercentrum. Attached to the 

 anterior edge of the first sacral is an intercentrum which underlies 

 the space between the last lumbar and the first sacral. This is the 

 only intercentrum preserved in the specimen. The total length of 



Fig. 17. — Superior view of the posterior five vertebrae shown in Fig. 16. 



the sacrum and six presacrals is 0.33™ The average height of 

 the vertebrae is o.i65 m . 



The vertebrae of specimen No. 1076 consists of five anterior dor- 

 sals in series, and, after a break, six more in series connected with 

 the two sacrals, making thirteen in all. The vertebrae are smaller, 

 but present no points of generic difference from specimen No. 1077 

 and are less well preserved. The five anterior vertebrae are all of 

 the same type, and the description given of the vertebrae in No. 1077 

 is strictly applicable. In the middle of the series the heads of two 

 or three ribs are preserved, and show that there was no division into 

 a capitulum and tuberculum, nor any approach to such a division. 

 There are no intercentra preserved. In the posterior series the 

 transverse processes of the vertebrae show the same series of changes 

 as described in No. 1077, and the sacrals confirm the observations 

 made on that specimen. 



