194 CHELONIA. 



bone with the exception of a portion at the postero-internal 

 angle. Allowing for its larger size this specimen agrees 

 in all characters with the hyoplastral of H. latiscutata, 

 showing the narrowness of the incision for the entoplas- 

 tral. It is readily distinguished from PUsiochelys by the 

 wider inframarginal shields, of which the outer border 

 was placed on the marginal bones. Mantell Collection. 



2299. Slab showing the dorsal aspect of an apparently similar right 

 hyoplastral; from Cuckfield. The narrowness of the notch 

 for the entoplastral is well shown. Mantell Collection. 



39457. Slab exhibiting the ventral aspect of the left side of a 

 plastron, of which the hyoplastral agrees very closely with 

 No. 2313 ; from the Purbeck of Swanage, Dorsetshire. 

 The ento- and epiplastrals are wanting, and the xiphi- 

 plastral is imperfect. The entoplastral agrees generally 

 with that of H. latiscutata, but is still shorter ; the sulcus 

 dividing the abdominal and femoral shields extends obliquely 

 upwards from the middle of the inguinal notch to the 

 large heart-shaped mesial vacuity. This specimen, if not 

 specifically identical with the Wealden examples, indicates 

 a closely allied form. 



Bowerhanh Collection. Purchased, 1865. 



2261. Slab exhibiting the ventral aspect of an imperfect right hypo- 

 plastral agreeing very closely with the corresponding bone 

 of the preceding specimen ; from the Wealden of Cuckfield. 



Mantell Collection. 



2288. Slab exhibiting the dorsal aspect of a similar hypoplastral 



{Fig.) of the right side ; from Cuckfield. Figured by Owen, op. 



cit. pi. ix. fig. 1, in a reversed position as a hyoplastral, 



under the name of Platemys mantelli, of which it is the 



type. Mantell Collection. 



2296. Slab exhibiting several imperfect marginals which not im- 

 probably belong to this form ; from Cuckfield. 



Mantell Collection. 



3541. An imperfect right humerus, agreeing closely with the cor- 

 responding bone of No. 2289; from Cuckfield. The 

 proximal portion of this specimen is wanting, but the re- 

 maining part resembles the humerus of Chelys. 



Mantell Collection. 



