168 



SAUEOPTERYGIA. 



Thaumatosaurus carinatus (Cuvier 1 ). 



Syn. Plesiosaurus carinatus, Cuvier 2 . 



Imperfectly known, but apparently of the approximate size of 

 T. indicus. The cervical vertebrae have a very prominent haemal 

 carina, with a deep pit on either side. 



Hah. Europe (France and England). 



R. 1066. The centrum of an immature cervical vertebra ; probably 

 from the Kimeridge Clay of England. This specimen, 

 which is apparently late in the series, agrees almost 

 exactly with the immature type cervical from the 

 Kimeridgian of Boulogne, which is figured by Sauvage 

 in the ' Ann. Sci. Nat.' — Zool. ser. 6, vol. viii. pi. xxvi. 

 fig. 2 (1879), of which the dimensions are: — length 

 0,013 (1-7 inches), height 0,055 (2-15 inches), width 

 0,058 (2*3 inches). In the type the division of the costal 



Thaumafcsaurus (of.) carinatus. — Anterior and left lateral aspects of the cen- 

 trum and base of the arch of a cervical vertebra ; from the Kimeridge 

 Clay of Shotover. \. co, costal facets. 



facet is not clearly shown, although this is indicated by 

 its vertical dimension ; in the present specimen the 

 division is very distinct. The pits on either side of the 

 carina are very deep, and the rugosities on the terminal 

 borders of the inferior face very distinct. The cupping 

 of the terminal faces and the absence of prominence in 

 the cos Lai facets distinguish this specimen from the cer- 

 vicals of Peloneustes, Purchased. 1888. 



1 Ossein ens Fossiles, 2nd ed. vol. v. pt. ii. p. 486 (1824). — Plesiosaurus. 

 - Loc. cit. 



