154 



SAUROPXEEYGIA. 



resemblance of this specimen to the larger type femur 

 (fig. 50), and also to the corresponding bone of the limb 

 of P. philarchus No. 47410 (p. 158), leaves little donbt of 

 the generic identity of the two. No history. 



Fig. 50. 



Peloneustes 



— A femur ; from the Himeridge Clay of Swindon. 

 T V . (After Phillips.) 



Peloneustes philarchus (Seeley l ). 



Syn. Plesiosaurus philarchus, Seeley 2 . 



Thaumatosaurus philarchus, Lydekker 3 . 



The type species. Premaxilla with five teeth, and 37 or 38 in the 

 mandible, of which at least 14 are in the symphysis ; some 20 or 21 

 cervical vertebrse, in which the neural canal is not sunk into the 

 centrum. The mandible and paddle from the Oxford Clay, figured 

 on pp. 317, 318 of Phillips's ' Geology of Oxford,' indicate a larger 

 form allied to the present ; but the propodial bone of the paddle 

 belongs to a totally different and much smaller Sauropterygian. 



This species was founded upon an imperfect skeleton in the Cam- 

 bridge Museum, in which there are some 18 or 19 cervical vertebras ; 

 specimens in the collection of A. N. Leeds, Esq., of Eyebury, Peter- 

 borough, show the presence of 20 or 21 cervicals. 



Hob. Europe (England). 



1 Index to Aves&c. in Cambridge Museum, p. 139 (18G9). — Plesiosaurus. 



2 Loc. cit 3 Geol. Mag. dec. 3, vol. v. p. 353 (1888). 



