Plate XXVII. 



Fig. i, episternum and portion of clavicles of Plesiosaurus mudgei (?) Cragin, 

 from below. X 1/2. 



Fig. 2, dorsal vertebra of Plesiosaurus gouldii (type specimen), from the 

 front. X1/2. 



Fig. 3, the same, from the side. X 1/2. 



Drawn by Sidney Prentice. 



