PLESIOSAURID^. 141 



types of P. nitidus. Length of centrum 0,046 (1*4 inches), 

 height 0,065 (2-25 inches), width 0,071 (2-8 inches). 

 The characters of the centrum are precisely similar to 

 those of the next specimen. Purchased. About 1852. 



33111. The neural arch of a dorsal vertebra ; probably from Shot- 

 over. Although rather larger this specimen agrees precisely 

 with the arch of the preceding specimen. The horizontal 

 articular surfaces of the zygapophyses are well shown. 



Purcliased. About 1852. 



R. 1248. The slightly imperfect neural arch of a larger dorsal 

 vertebra ; probably from Ely. This specimen agrees in 

 relative size with the centrum No. 20280 (infra), and 

 has the facets for the centrum antero-posteriorly elongated, 



Purchased. About 1852. 



R. 1248 a. The imperfect neural arch of a lumbar (?) vertebra not 

 improbably associated with the preceding. The transverse 

 process has become lower and the facets for the centrum 

 are transversely elongated. Purchased. About 1852. 



46788. The neural arch of a small dorsal vertebra ; from the 



Kimcridge Clay of Foxhangers near Devizes, Wiltshire. 

 Probably belongs to the same individual as No. 46789 

 (infra). Cunnington Collection. Purchased, 1875. 



46788 a. A similar specimen belonging to the same individual. 



Cunnington Collection. 



46481. The centrum of a dorsal vertebra ; from Devizes. 



Cunnington Collection. 



46789. The centrum of a small anterior dorsal vertebra ; from Fox- 



hangers. Length 0,031 (1-12 inches), height 0,053 (2-18 

 inches), width 0*058 (2*3 inches). Cunnington Collection. 



46789 b. A very similar centrum ; from Foxhangers. 



Cunnington Collection. 



46789 c. The worn centrum of what is probably a pectoral vertebra, 

 of the same relative size as the preceding ; from Fox- 

 hangers. Cunnington Collection, 



R. 254. The centrum of a later dorsal vertebra of rather larger 

 size than that of No. 31925 ; from Shotover. 



Egerton Collection. Purchased, 1882. 



