TRIONYCHIDJE. 13 



R. 1420. Cast of a slab of gypsum, showing the dorsal aspect of a 

 costal bone, imperfect proximally. The original is the type 

 and is preserved in the Paris Museum. It was obtained 

 from the Upper Eocene (Lower Oligocene) of Montmartre, 

 and is figured by Cuvier in the ' Ossemens Fossiles/ 2nd 

 ed. vol. iii. pi. lxxvi. fig. 2. 



Mantell Collection. Purchased, 1838. 



Trionyx barbaree, Owen \ 



Apparently allied to the next species, from which it is distin- 

 guished by the more vaulted and ovoid carapace, and the somewhat 

 coarser sculpture on the same ; it being assumed that the contour of 

 the carapace in the types of this and the next form is the natural 

 one. 



Hab. Europe (England). 



30409. The carapace ; from the Upper Eocene (Lower Oligocene) 

 {Fig.) of Hordwell, Hampshire. The type specimen. Described 



and figured by Owen in his ' Eeptilia of the London Clay, 



&c.' vol. i. pt. i. p. 50, pi. xvi. a. 



Hastings Collection. Purchased, 1855. 



R. 1592. A larger imperfect carapace, apparently specifically iden- 

 tical with the preceding specimen ; from Hordwell. This 

 specimen shows the same vaulted contour as the type ; 

 the borders of the costals being devoid of reticulate 

 sculpture. Some of the neurals are wanting, and the 

 nuchal and several of the costals have been broken. 



Purchased, 1889. 



Trionyx henrici, Owen 2 . 



Syn. Trionyx marginatus, Owen 3 . 



Carapace moderately depressed, and wide, with comparatively 

 fine reticular sculpture; borders of costals with a more or less 

 defined band devoid of reticular sculpture. Nuchal bone strongly 

 emarginate anteriorly, and highly convex, with the sculptured por- 



1 ' Keptilia of the London Clay, &c.' (Mon. Pal. Soc), vol. i. pt. i. p. 50 

 (1849). 



2 Ibid. p. 46. The name does not occur in Eep. Brit. Assoc, for 1847, Trans, 

 of Sections, p. 65 (1848), to which reference is made by Owen. 



3 Ibid. p. 55. 



