EXPLANATION OF PLATE 17. 



Fis;. 1. Sfmstasayrus osmonli Merriam. Posterior dorsal, pelvic and anterior caudal regions. 

 with elements of posterior arch and limbs, no. 9!i08, about '/r <>f natural si/e. 



Fig. 2. DelpJrinosaitrns perriiii Merriam. Elements of posterior arch and limbs, no. 9119. 

 i< 

 ijr. 3. Shastasaurus pacificus ilerriam. Pubis of type specimen, about -Jin of natural si/e. 



x y 1( , 



[190] 



