PLESIOSAUPvID^E. 187 



35295 f. A considerably larger imperfect cervical vertebra. Figured, 



{Fig.) op. cit. pi. v. figs. 3-5. The ribs and arch are anchylosed 



to the centrum. Purchased, 1859. 



35295 g. A cervical vertebra, wanting the neural spine and ribs. 

 Length of centrum 0,040 (1*55 inches), height 0,051 

 (2-0 inches), width 0,051 (2*0 inches). Purchased, 1859. 



35295 h. Four centra of cervical vertebra?. One specimen has the 

 pedicles of the arch attached. Purchased, 1859. 



36150. The neural arch and spine of a large cervical vertebra. In 

 contour this specimen closely resembles the arch of the 

 cervical of C. valdensis, No. E,. 009 (p. 189). 



Purchased, 1801. 



35307. Three imperfect centra of associated dorsal vertebra?, 

 agreeing closely with the following specimens. 



Purchased, 1859. 



361 50 a. Seven imperfect associated centra of dorsal vertebra?. These 

 specimens agree in relative size with the large cervical, No. 

 35295 b ; the dimensions of the best preserved specimen 

 being :— length 0,054 (2*15 inches), height 0,069 (2-7 

 inches), width 0,076 (3-0 inches). The terminal faces 

 are distinctly cupped ; and the whole contour of these 

 specimens is very similar to that of the dorsals of C. 

 eurymerus, No. 46484 (p. 207). Purchased, 1861. 



The following specimens indicate the existence of this or a closely 

 allied species at the period of the Lower Greensand ; th< ir 

 resemblance to the Upper Cretaceous specimens and the absence 

 of vertebrce of similar type in the Kimeridge Clay indicate that 

 these specimens were not derived from the latter deposit. 



42102. The centrum of an anterior cervical vertebra ; from the 

 Noocomian bone-bed of Potton, Bedfordshire. This speci- 

 men presents no characters by which it can be specifically 

 distinguished from the early cervicals from the Cambridge 

 Greensand, exhibiting the same large costal facets and 

 the prominent haemal ridge Purchased^ L870. 



40456. The centrum of a later cervical vertebra; from Potton. 



Purchase l } 1 v 7 ( K 



