PLESIOSAUEID^. 239 



36137. The associated centra of four posterior cervical and one 

 " pectoral " vertebrae ; from the Lower Oxford Clay of 

 Chippenham, Wiltshire. The dimensions of the best pre- 

 served cervical are : — length 0,042 (1*92 inches), height 

 0,059 (2-35 inches), width 0,074 (2-94 inches); these 

 measurements having nearly the same proportions as in 

 the 44th cervical associated with No. R. 1262, described 

 by Seeley, op. cit. p. 203. Purchased, 1861. 



47417. Seven associated vertebrae, mostly imperfect ; from the 

 Oxford Clay of Whittlesea, near Peterborough. These 

 specimens comprised two late cervicals, three "pectorals," 

 and two anterior dorsals. In one of these " pectorals " 

 the arch, with the exception of the zygapophyses, is entire. 

 The dorsals agree exactly with No. R. 1281 (infra). 



Sharp Collection. Purchased, 1876. 



47880. Two nearly entire " pectoral " and one anterior dorsal ver- 



tebra ; from the Oxford Clay near Oxford. In one of the 

 " pectorals" the dimensions of the centrum are: — length 

 0,058 (2-3 inches), height 0,054 (2-15 inches), width 

 0,076 (3 - inches). The forward overhang of the upper 

 part of the centrum is strongly marked. These indicate 

 a large individual. 



Presented by the Hon. R. Marsham, 1877. 

 R. 1280. Five associated dorsal vertebrae, in a somewhat imperfect 

 condition ; from the Oxford Clay of Peterborough. In 

 the best preserved example the dimensions are : — length 

 0,052 (2-05 inches), height 0,056 (2-2 inches), and width 

 0,063 (2-48 inches); with a height of about r 127 

 (5*0 inches) from the base of the neural canal to the 

 summit of the spine. These specimens agree precisely with 

 the dorsals of the skeleton No. 22 {supra, p. 238), in the 

 possession of the donor. 



Presented by A. N. Leeds, Esq., 1888. 



R. 1281. Two somewhat imperfect associated dorsal vertebra; ; from 

 the Oxford Clay of Peterborough. 



Presented by A. N. Leeds, Esq., 1888. 



16045. The centrum of a somewhat larger dorsal vertebra belonging 

 either to the present or a closely allied species ; from the 

 Oxford Clay of Peterborough. Purchased. About 1840. 



47881. The centrum of a small immature dorsal vertebra; from the 



Oxford Clay near Oxford. 



Presented by the Hon. R. Marsham, 1877. 



