EXPLANATION OF PLATE 7. 



Shastasaurus perrin n. sp. 



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



natural sice. 



Fig. 1. — Antero -posterior section of posterior dorsal vertebra. Constructed 

 from the 32nd and 33rd vertebra 3 of this series. 



Fig. 2. — Dorsal vertebra 3 ; 25th to 27th of this series. 



Fig. 3. — Caudal vertebra, with lower arches in side and front view; 47th 

 vertebra of this series. 



Fig. 4. — Anterior side of a left dorsal rib. Opposite 22nd vertebra of this 

 series. 



