140 CHELONIA. 



3543. The inguinal region of the right hypoplastral ; from Cuck- 

 field. The vermiculated nature of the sculpture is very 

 marked. Mantett Collection. 



3543 a. The axillary region of the right hyoplastral; from Cuck- 

 field. Probably associated with the preceding. 



Mantell Collection. 



2275 x. The left xiphiplastral ; from the Wealden of Cuckfield. 

 Except for its larger size, this specimen cannot be distin- 

 guished from the xiphiplastral of the type specimen of 

 Peltochelys figured by Dollo in the ' Bull. Mus. R. Hist. 

 Nat. Belg.' vol. iii. pi. iii. fig. 2. Mantell Collection. 



28029. Fragment of sandstone, showing the outer surface of a small 

 portion of the carapace ; from Cuckfield. 



Mantell Collection. Purchased, 1838. 



39213. Fragment of Tilgate grit, showing a posterior marginal bone 

 belonging either to this or the next species. 



Purchased, 1865. 



3528. Fragment of sandstone, showing part of a costal of a small 

 individual; from Cuckfield. 



Mantell Collection. Purchased, 1853. 



Tretosternum, sp. 



Larger than the preceding, with the outer extremity of the gular 

 shield extending lower down on the plastron ; plastral sculpture as 

 in T. balcewelli. Whether these differences are specific or sexual 

 cannot at present be determined. 



Hob. Europe (England). 



R. 970. Part of the right epiplastral ; from the Wadhurst Clay 

 (Lower Wealden) near Hastings, Sussex. This specimen 

 shows the outer part of the gular shield, which extends 

 lower down on the side of the pectoral than in T. bakewelli, 

 No. 3508. Dawson Collection. Purchased, 1887. 



R. 970 a. Fragment of the right hyoplastral associated with the 

 preceding. Dawson Collection. 



R. 970 b. A right posterior costal bone, not improbably referable to 

 the same species as the preceding ; from the Wadhurst 

 Clay near Hastings. Dawson Collection. 



