PLESI0SAUR1DJS. 223 



(Mem. Pal. Soc), suppl. iv. pis. vii.-ix. (1S64). Tlie di- 

 mensions of a cervical centrum are: — length 0,070 (2-75 

 inches), height 0,061 (2*4 inches); of a "pectoral": — 

 length 0,063 (2*46 inches), height 0,065 (2-56 inches),width 

 0,085 (3-35 inches) ; of a dorsal :— length 0,055 (2-17 

 inches), height 0,063 (2*48 inches), width 0,068 (2-68 

 inches) ; and of another dorsal : — length 0,067 (2*65 

 inches), height 0,072 (2-85 inches). 



Presented by W. H. Bensted, Esq. About 1862. 



11901. The centrum of a small dorsal vertebra provisionally referred 

 to this species ; from the Lower Greensand of Farringdon, 

 Berkshire. This specimen, which belongs to an immature 

 individual, has the same proportions as in the dorsals of 

 the type. Mantell Collection. Purchased, 1838. 



Cimoliosaiirus neocomiensis (Campichc 1 ). 



Syn. Plesiosaurus neocomiensis, Campiche 2 . 

 ? Plesiosaurus yurgitis, Eenevier 3 . 



Still more imperfectly known than the preceding, but apparently 

 of smaller dimensions, with the centra of the " pectoral " and dorsal 

 vertebrae relatively shorter, and their terminal faces less cupped 

 and more mammillated. 



The vertebras referred to this species by Owen and Kiprijanoff 

 are noticed above (p. 183). 



Hob. Europe (Switzerland). 



40164. Cast of an imperfect " pectoral " vertebra, probably belonging 

 to this form. The original was obtained from the Middle 

 Neocomian (Lower Greensand) of Switzerland. Figured 

 by Pictet and Campiche in the ' Paleontologie Suisse,' ser. 2, 

 pi. v. fig. 2. Dimensions of centrum : — length 0,037 (1*45 

 inches), height 0,042 (1'65 inches), width 0,055 (2-15 

 inches). The anchylosis of the arch indicates maturity. 



Presented by M. CamjncJie, 1866. 



40164 a. Cast of the centrum of a dorsal vertebra. The original 

 is the type, and was obtained from the Lower Neocomian 

 of Switzerland ; it is ligured by Pictet and Campiche, op. 

 cit. pi. vi. fig. 1 ; a nearly similar specimen being figured 



1 In Pictet's ' Materiaux pour la Palejntologie Sui.s33,' ser. 2, art. 1, p. 42 

 (1858-60).— Plesiosaurus. 



2 Loc. cit . ' Ibid. s=6r. 1, art. 1, p. 5 (1858). 



