274 SAUKOPTEKYGTA. 



tebrae; from the Lower Lias of Lyme-Eegis. These 

 specimens comprise one late cervical, four " pectorals," 

 and seven dorsals. The late cervical and the pectorals 

 agree closely with the corresponding vertebrae of the 

 type skeleton figured by Owen, op. cit. pi. xii. ; the 

 summit of the neural spine in the cervical is unfortunately 

 broken off, but sufficient remains to show the charac- 

 teristically short and pointed contour. The costal facets 

 show traces of a division, and have become vertically 

 elongated, in place of the longitudinal elongation shown 

 in "No. 39849. The dimensions of the centrum of the 

 cervical are : — length 0,044 (1*74 inches), height 0,052 

 (2-05 inches), width 0-063 (2*48 inches). 



Pur chased, 1853. 



Of the following teeth it is probable that some belong to the present 

 or the next species, while others may be referable to P. conybeari. 



41284. A crushed tooth, in matrix ; from Lyme-Eegis. 



Purchased, 1869. 



42015. A very similar tooth ; from Lyme-Eegis. Purchased, 1870. 



43059. A smaller tooth, in matrix ; from Lyme-Eegis. 



Purchased, 1871. 



32747. A large tooth ; from Lyme-Eegis. Purchased, 1857. 



It. 1371. A tooth of similar type, in matrix ; from Lyme-Eegis. 



No history. 



Plesiosaurus, sp. 



Apparently allied to P. rostratus, but of somewhat larger dimen- 

 sions. Cervical vertebrae with the ridge on the haemal surface more 

 prominent, the costal facets distinctly double, and in the anterior 

 part of the region the pits on either side of the haemal ridge not 

 distinctly developed. Terminal faces of the dorsal centra heart- 

 shaped. 



Bab. Europe (England). 



R. 1328. The centrum of a posterior cervical vertebra ; from the 

 Lower Lias, locality unknown. The dimensions of this 

 specimen are : — length 0,051 (2-0 inches), height 0,054 

 (2-13 inches), width 0,068 (2-66 inches). It agrees in 

 general characters with the 30th or 31st vertebra of the 



