PLESIOSArRIDJE. 



129 



the general type of the corresponding bone of Peloneustes philarchus. 

 This species may have been the ancestor of the preceding. 



The probability of this species being identical with the French 

 and Russian forms noticed under the name of P. grossouvrei is 

 mentioned under that heading. 



Hab. Europe (England). 



47837. Cast of the atlas and axis vertebrae, with the first intercen- 

 trum. The original, which belongs to the type skeleton, 

 was obtained from the Oxford Clay (Middle Jurassic) of 

 Eynsbury, near St. Neots, Huntingdonshire ; and is 

 preserved in the Woodwardian Museum, Cambridge. The 

 specimen is noticed by Seeley in his 'Index to Aves &c. 

 in the Cambridge Museum/ p. 116, and described and 

 figured in the ' Quart. Journ. Geol. Soc' vol. xxxiii. 

 pp. 716, 717, figs. 1, 2. The atlas and axis are not 

 anchylosed together. 



Presented by Prof. H. G. Seeley, 1876. 



Fig. 39. 



Pliosaurics cvansi. — Eight lateral and anterior aspects of the centrum of the 

 fourth cervical vertebra ; from the Oxford Clay of Huntingdonshire. 

 £ nat. size. (From the ' Quart. Journ. Geol. Soc.') 



R. 1243. The centrum of a middle cervical vertebra; probably from 

 the Oxford Clay, locality unknown. Length 0,040 (1*58 

 inches), height 0,076 (30 inches),width 0,081 (3*18 inches). 

 The contour of the terminal faces is subcircular, and the 

 clues are distinctly bevelled ; the upper costal facet is 

 connected by a ridge with the facet for the neurapophysis, 

 and there is no haemal carina. This specimen, which 

 presents every appearance of being adult, cannot bo dis- 

 tinguished from the middle eervicals of the type. 



No history, 



PAKT H. K 



