SUPPLEMENT. 277 



R. 1670. An associated left radius and ulna ; probably from the 

 Kimeridge Clay ; locality unknown. These bones have 

 the general contour of those of C. plicatus and C. richard- 

 soni, but the radius is more elongated; it is not impro- 

 bable that they belong to O. truncatus or an allied form. 

 Presented by the Dorsetshire Museum, 1889. 



R. 1682. A large humerus, wanting a portion of the shaft, pro- 

 bably referable to this genus ; from the Kimeridge Clay of 

 the Isle of Portland. This specimen closely resembles No. 

 31791 {supra, ii. p. 148), and it is not improbable that 

 both may be referable to C. truncatus. 



Presented by G. Clifton, Esq., 1889. 



Genus PLESIOSAURUS (supra, ii. p. 252). 



Plesiosaurus dolichodirus (supra, ii. p. 255). 



It may be observed that the name Plesiosaurus priscus, Parkinson 1 , 

 was applied to the vertebrae figured by Conybeare in his original 

 description of the genus, but it cannot be determined to which of 

 the forms subsequently named P. dolichodirus and P. hawhinsi these 

 specimens are referable. 



R. 1756. Slab showing a considerable part of the vertebrae and the 

 pelvis, together with the paddles of the right side pro- 

 bably referable to the same individual ; from the Lower 

 Lias of Lyme-Eegis. Sixteen cervical vertebrae now re- 

 main ; these and the dorsals being seen from the right 

 side, while the pelvis and anterior caudals have their 

 dorsal surfaces exposed. The ilia are well displayed, and 

 the paddles show all the features characteristic of this 

 species. Purchased, 1889. 



1 Introduction to Oryctology, p. 294 (1822). 



