PLESlOSArRlDJE. 



183 



Cimoliosaurus cantabrigiensis, Lydekker (n. sp. '). 



Including Plesiosaurus neocomiensis, Owen 2 (no?i Pictet and Carnpiche). 



Very imperfectly known ; of moderate size. Cervical vertebras 

 elongated, with the terminal faces of the centra moderately Clipped 

 and slightly bevelled at the edges ; and the arches having a very 

 prominent lateral ridge descending obliquely from the outer surface 

 of the prezygapophysis to the posterior border of the pedicle. 

 The dorsal vertebrae figured by Owen as Plesiosaurus neocomiensis 

 would agree in relative size with the undermentioned cervicals and 

 may belong to the same form ; they are characterized by a mam- 

 milla in the centre of the terminal face of the centrum. 



Hob. Europe (England). 



The following specimens are from the Cambridge Greensand. 

 R. 461. Three associated imperfect anterior cervical vertebras. 

 Length of centrum 0,033 (1-3 inches), height 0,032 

 (1-25 inches), width 0,034 (1-35 inches). 



Presented by Sir B. Owen, K.C.B., 1884. 



Eig. 60. 



-pr.z 



Cimoliosaurus cantabrigiensis. — Anterior and lefl lateral aspects of a cervical 

 vertebra; from the Cambridge Greensand. g. pr.e, pre-, i>t.z, post- 

 zygapophysis. 



1 The specific names applied by Seeley in his 'Index &c.' to the Plesiosaur 

 of the Cambridge Greensand arc not defined (vide infra, p. 24(>). 



2 Cretaceous Reptilia (Mon. Pal. Soc), suppl. iv. p. 11 (1801). 



