184 SAUKOPTERYGIA. 



R. 461 a. Two larger cervical vertebrae in a less imperfect condition, 

 {Fig.) probably from the later part of the neck of the same 

 individual as the preceding. These specimens (fig. 56) 

 are the types. The dimensions of the centrum are : — 

 length 0,039 (1-54 inches), height 0,034 (1*35 inches), 

 width 0,041 (1*6 inches). If these specimens belong to 

 the same individual as the preceding, and the under- 

 mentioned cervicals of C. bemardi are likewise associated 

 specimens, the specific distinctness of the two forms will 

 be pretty certain, since in one case all the centra are long, 

 while in the other they are all short. The centra of the 

 present form are much less cupped than in the cervicals 

 of O. bemardi, the cupping being most marked posteriorly. 

 Presented by Sir R. Owen, K.C.B., 1884. 



The following specimens, which ivere referred by Oiven to Plesio- 

 saurus neocomiensis, may be referable to this species. 



35285. The centrum .of a small late cervical vertebra. The costal 

 facet on one side is relatively high; the cupping of the 

 terminal faces is the same as in the preceding specimens, 

 but there is a mammilla in the centre, and the length is 

 less. Purchased, 1859. 



36151. The centrum of a small "pectoral" vertebra. Figured by 

 {Fig.) Owen, op. cit. pi. vi. figs. 7, 8, as P. neocomiensis. This 

 specimen is evidently specifically identical both with Nos. 

 35285 and 36151 b. It has distinct mammillae and well 

 cupped terminal faces, but the haemal ridge has practically 

 disappeared. Purchased, 1861. 



36151 a. The centrum of a small anterior dorsal vertebra. 



Purchased, 1861. 



36151 b. The centrum of a later immature dorsal vertebra. Figured 

 {Fig.) by Owen, op. cit. pi. vi. figs. 8-11, as P. neocomiensis. 

 Length 0,034 (1-35 inches), height 0,042 (1-15 inches), 

 width 0,046 (1*8 inches). The mammillae are well 

 developed. The type dorsal of Cimoliosaurus neocomiensis 

 (p. 223) has flatter terminal faces, and a less distinct 

 anterior overhang of the upper part of the centrum. The 

 present specimen has a strong general resemblance to the 

 dorsals of O. oxoniensis. Purchased, 1861. 



36151 C, d. Two similar specimens. Purchased, 1861. 



36151 e. A more imperfect dorsal centrum. Purchased, 1861. 



