234 



SAUROPTERYGIA. 



Some or all of the following specimens may be specifically distinct. 



44188. Two imperfect anterior (?) cervical vertebrae ; from the 

 Kimeridge Clay of Weymouth, Dorsetshire. In one 

 specimen the greater part of the arch is preserved. In the 

 other the dimensions of the centrum are : — length 0,056 

 (2-2 inches), height 0,046 (1-8 inches), width 0,057 (225 

 inches). Purchased, 1873. 



33123. A similar imperfect cervical vertebra ; from the Kimeridge 

 Clay of Shotover, near Oxford. 



Purchased, 1859. 



24803. An imperfect dorsal vertebra ; from the Kimeridge Clay of 

 Wootton-Bassett, Wiltshire. Length 0,062 (2-45 inches), 

 height 0,060 ('2-35 inches), width 0,069 (2*72 inches). 



Cunnington Collection. Purchased, 1849. 



The following specimens are from the Neocomian bone-bed of Potton, 

 Bedfordshire, and were doubtless derived from the Kimeridge 

 Clay. 



42032. The centrum of a dorsal vertebra. Purchased, 1870. 



40442-3. Two centra of dorsal vertebrae of the same general type 

 as the last, but more constricted laterally, and perhaps 

 indicating a different species. Purchased, 1867. 



Cimoliosaurus plicatus (Phillips *). 



Syn. Plesiosaurus plicatus, Phillips 2 . 



Plesiosaurus infraplanus, Phillips 3 . 

 (?) Plesiosaurus hexagonalis, Phillips 4 . 

 Murcenosaurus leedsi, Seeley 5 . 

 Plesiosaurus leedsi, Whidborne 6 . 



Of medium size. Cervical vertebras 44 in number ; those of the 

 anterior and middle region having the centra considerably elongated, 

 with the length somewhat exceeding the height, but the posterior 

 ones somewhat shorter ; the terminal faces slightly cupped and 

 without a median pit ; and the haemal foramina separated by a 

 nearly flat surface, the terminal borders of the outer surface of the 



1 Geology of Oxford, p. 313 (1871). — Plesiosaurus. 



2 Log. cit. 3 Ibid. p. 374. 4 Ibid. p. 375. 



5 Quart. Journ. Geol. Soc. vol. xxx. p. 197 (1874). 



6 Ibid. vol. xxxvii. table facing p. 480 (1881). 



