plesiosatjkid^:. 233 



of the centrum is very similar to that of Xo. 47421, but 

 the length is relatively greater, as is shown by the following 

 dimensions : — length 0,074 (2*9 inches), height 0,073 

 (2-78 inches), width 0,080 (3-15 inches). Purchased, 1869. 



R. 1259. A very similar specimen ; from the Kimeridge Clay of 

 Dorsetshire. The anterior face is somewhat more cupped 

 than in the preceding. Ao history. 



44819. The centrum of a very similar vertebra ; from the Kimeridge 

 Clay, locality unknown. 



Presented by B. Bright, Esq., 1873. 



20280 a. A larger imperfect dorsal vertebra ; from the Kimeridge 

 Clay of Ely. Xot improbably associated with Xo. 202S0. 



Purchased, 1846. 



47505. A very large dorsal vertebra ; from the Kimeridge Clay of 

 Dorsetshire. The left transverse process and the summit 

 of the neural spine are wanting. Length of centrum 

 0,085 (3-34 inches), height 0,099 (3-92 inches), width 

 0,096 (3-8 inches) ; distinct overhang is shown in the 

 centrum. Presented by J. C. Mansel-Pleydell, Esq., 1870. 



R. 1260. A large posterior dorsal vertebra, provisionally referred 

 to this species ; from the Kimeridge Clay of Shotover. 

 The centrum is relatively shorter than in the preceding 

 specimen, with the anterior face more deeply cupped, and 

 the haemal surface narrower and sharper. The transverse 

 processes, of which the right is wanting, are also shorter. 



. So history. 



R. 1261. An imperfect lumbar vertebra provisionally referred to 

 this species ; from the Kimeridge Clay of Kimeridge Bay, 

 Dorsetshire. 



Presented by J. C. Mansel-Pleydell, Esq., 1888. 



24684 c. The centrum of an immature dorsal vertebra ; from the 

 Kimeridge Clay of AVootton-Bassett, Wiltshire. The 

 haemal surface has been crushed in. 



Cunnington Collection. Purchased, 1849. 



R. 273. A small and apparently immature propodial bone not 

 improbably referable to this species ; from the Kimeridge 

 Clay of Shotover. The type of Plesiosaurua dcedicomus. 

 Described by Owen in the 'lie]). Brit. Assoc.' for 1839, 

 p. 81. The proximal extremity is decorticated. 



Egerton Collection. Purchased, 1882. 



