EXPLANATION OF PLATE IX. 



Bones of Protoatega gigas, one-third natural size. 



Figs. 1-3. Marginal bones : 1 a, lateral from above ; 2, another lateral from below ; 2 a, the same from 



one end ; 3, ? caudal marginal. 

 4-7. Ribs ; 7, posterior. 

 Fig. r\ Cervical vertebra of Jlyposaurus velbiatius, two-thirds the natural size : a, from the side; 6, f on 



the front ; c, from below ; d, from above. 



