EXPLANATION OP PLATE 9. 

 Shastasaurus osmonti n. sp. 



All figures are from the type specimen, and are represented three-fourths 

 natural size. 



Fig. 1. — Superior side of 11th centrum of this series. 



Fig. 2. — Antero-posterior section of 35th centrum of this series. 



Fig. 3. — Posterior view of an anterior dorsal arch, showing separate zyga- 

 pophysial facets. The summit of the spine should probably be 

 represented as slightly excavated, but could not be sufficiently 

 well prepared to show this character. 



Fig. 4. — Side view of anterior dorsal arch shown in figure three. 



Fig. 5. — Anterior view of anterior dorsal arch shown in figure three. 



Fig. 6. — Posterior view of a right dorsal rib. 



