PLESIOCHELYID^. 191 



type specimen. Figured by Mantell in his ' Fossils of 

 Tilgate Fossil,' pi. vi. fig. 2 (without name) ; also in his 

 ' Medals of Creation/ 1st ed. p. 776, and 2nd ed. p. 735, 

 fig. 240, and in his ' Petrifactions and their Teachings,' 

 p. 156, fig. 83. These woodcuts are reversed and turned 

 the wrong way upwards. The extremity of the sulcus of 

 the first vertebral shield is shown, and also that dividing 

 the first and second costal shields. The contour of these 

 sulci agrees closely with the same part in the type species, 

 and shows that the vertebral shields were of similar pro- 

 portions. Mantell Collection. Purchased, 1853. 



2370. Slab of sandstone showing the ventral surface of the anterior 

 {Fig.) portion of the left side of the carapace ; from the Wealden 

 of Cuckfield. Figured by Owen in his ' Wealden and 

 Purbeck Reptilia,' pt. i. pi. viii. fig. 1, as Ghelone costata, 

 of which it is the type. The specimen shows the first and 

 second marginals, the lateral extremity of the nuchal, and 

 the greater portion of the first and second costals. Al- 

 lowing for the difference in the age of the individuals to 

 which the two specimens belonged, the extremity of the 

 second costal accords well with the type. 



Mantell Collection. Purchased, 1838. 



2281. Slab of sandstone exhibiting the ventral aspect of the nuchal 

 and of a costal bone ; from Cuckfield. The extremity of 

 the nuchal agrees precisely with the fragment in No. 

 2370, and the contour of the entire bone is very similar to 

 that of the type species. Mantell Collection. 



2306. Fragment of sandstone exhibiting the ventral aspect of the 

 distal portion of the first left costal of a large individual ; 

 from Cuckfield. The extremity of the rib is wanting, but 

 the portion remaining agrees with the corresponding bone 

 of No. 2370. Mantell Collection. 



2276. The imperfect distal portion of the first left costal; from 

 Cuckfield. This specimen agrees precisely with the corre- 

 sponding bone of H. latiscutata, showing part of the 

 antero-lateral border of the second vertebral shield. The 

 same thickening of the rib is shown on the right of the 

 shell No. 23264 of H. latiscutata, and also in Idiochelys. 



Mantell Collection. 



3505. Part of the first costal of the right side ; from Cuckfield. 



Mantell Collection. 



