plesiosaurim:. 231 



the Oxford Museum from the same locality, one of which is figured 

 on p. 373 of Phillips's ' Geology of Oxford.' 



It is not improbable that there is a complete transition from the 

 smallest individuals of this form to the largest ones noticed under 

 the head of G. plicatus, and there may he two species included under 

 the present specific heading. It is highly probable that limb-bones 

 of this species are included among those mentioned on pp. 147-151. 



The specimens noticed by Sauvage are from the Kimeridgian of 

 Boulogne. 



Hob. Europe (England and France). 



44636. The centra of two small immature cervical vertebrae ; from 

 the Kimeridge Clay of AVeymouth. These specimens are 

 scarcely distinguishable from the cervical of C. plicatus, 

 No. R. 1282. Purchased, 1873. 



44596. The centra of two rather larger associated cervical vertebrae ; 

 from the Kimeridge Clay of Swindon, Wiltshire. The 

 cupping of the terminal faces is well marked, and the 

 interforaminal space on the hsemal surface nearly flat; 

 the arches were not anchylosed to the centrum. 



Presented by the Directors of the Swindon 

 Brick and Tile Company, 1876. 



R. 1288. Cast of the centrum of a larger immature middle cervical 

 vertebra. The original was obtained from the Kimeridge 

 Clay of Shotover, near Oxford, and is preserved in the 

 Oxford Museum. It is figured by Phillips on p. 374 as 

 a variety of C. plicatus. The terminal faces are more 

 decidedly cupped than is usually the case, but this can 

 scarcely be regarded as a specific character. 



Made in the Museum, 1888. 



44902. An imperfect late cervical vertebra ; probably from the 

 Kimeridge Clay of Shotover. The arch is completely 

 anchylosed. Length of centrum 0,0114 (2-") 2 inches), 

 height 0,063 (2-50 inches), width 0,082 (3-22 inches). 

 This specimen closely resembles the typo cervical figured 

 by Phillips on p. 373. 



Presented h : , Sir 11. Owen, K.C.B., 1874. 



20280. A very large posterior cervical vertebra, in a somewhat 

 imperfect condition; from the Kimeridge Clay of Ely, 

 Cambridgeshire. Length of centrum 0,080 (3*15 inches), 

 height 0,079 <:M inches), width <»,1<><) (3*94 inches). 

 The costal articulation is halfway up the side of the 



