EXPLANATION OF PLATE 1.'.. 



All specimens from the Upper Triassic of Shasta County, California. 



Figs. lo-li. Shastasaurus osmonti Merriam. no. 907fi. X Va- Anterior distal angle of hu- 

 merns, posterior distal angle of ulna, and posterior side of radiale, restored from elements of 

 right limb of this specimen. 



la. Superior side of left anterior limb. 



H, humerus ; R, radius ; U, ulna ; El, radiale. 

 16. Proximal end of humerus shown in fig. \a. 



Figs. 2a and 25. Shastasaurus carcyi ( ?) Merriam. no. 9(114. X V:\- 

 2a. Superior side of right anterior limb. 



II, humerus ; It, radius. 

 26. Proximal end of humerus shown in fig. 2a. 



Fig. 3. Shastasaurus osmonti Merriam. Marginal view of carpal or phalangeal element. 

 no. 9081, X Mi- 

 Fig. 4. Shastasaurus nxmonti Merriam. Elements of a transverse row of ossicles in 1he 

 rnesopodial or metapodial region of the anterior limb, showing reduction of the posterior ele- 

 ment, no. 9081, X Mi- 



|]86] 



