14 CHELONIA. 



tion also emarginate, and denned from the unsculptured ; lateral 

 dentations of the unsculptured portion indistinct, and a large moiety 

 of this part in advance of the median emargination. Centra of 

 dorsal vertebrae flattened inferiorly. 



It is difficult to find satisfactory grounds for specifically distin- 

 guishing T. marginatus from this species. 



Hab. Europe (England). , 



30407. The carapace, wanting the nuchal bone ; from the Upper 

 {Fig.) Eocene (Lower Oligocene) of Hordwell, Hampshire. The 

 type specimen. Described and figured by Owen in his 

 ' Eeptilia of the London Clay, &c.' pt. i. p. 46, pi. xvi. 

 In this specimen the first costal is very wide, and the 

 anterior angles of the first neural are not truncated; 

 while the unsculptured bands on the borders of the costals 

 are very indistinct. 



Hastings Collection. Purchased, 1855. 



30413. An entire but somewhat smaller carapace, which cannot be 

 specifically distinguished from the preceding ; from 

 Hordwell. In this specimen the first costal is narrower 

 than in the type, and the unsculptured bands on the borders 

 of the costals are very distinct. The anterior angles of 

 the first costal are not truncated. The sculpture is rather 

 coarser than in the type. The flattened hsemal surfaces of 

 the dorsal vertebras are shown. Hastings Collection. 



30406. A large carapace, wanting the nuchal ; from Hordwell. 



{Fig.) The type of T. marginatus. Described and figured by 

 Owen, op. cit. p. 55, pi. xix.*. The unsculptured bands 

 on the costals are very strongly marked, and the sculp- 

 ture is finer than in the last specimen, and more like ttha 

 of the type. Hastings Collection. 



32348. A nuchal bone ; from Hordwell. Figured by Owen, op. 

 cit. pi. xvi. fig. 3, as T. henrici. In general contour this 

 specimen resembles the nuchal of No. 30413, but has a 

 somewhat finer sculpture. Hastings Collection. 



R. 1430. An imperfect carapace, showing the first five costals of 

 the left side, and the first and second neurals; from 

 Hordwell. The form of the bones corresponds almost 

 exactly with the type, but the sculpture is coarser, and 



