PLESI0CHELYIDJ3. 193 



3500. A lateral marginal; from Cnckfielcl. Mantell Collection, 



3552. A lateral marginal ; from Cuckfield. Mantell Collection. 



2274:. The seventh marginal of the right side ; from Cuckfield. 



(Fig.) Figured by Mantell in his ' Fossils of Tilgate Forest/ pi. vi. 

 fig. 7. This specimen shows the pit for the insertion of 

 the inguinal pedicle. In its everted border it resembles 

 Podocnemis. Mantell Collection. 



R. 1521. Another specimen of the seventh marginal of the right 

 side ; from Cuckfield. Mantell Collection. 



2271. A flattened and imperfect specimen of the homologous bone ; 

 from Cuckfield. Mantell Collection. 



6002. A posterior marginal ; from Cuckfield. Mantell Collection. 



10823. Another specimen of a marginal serially homologous with 

 the last ; from Cuckfield. Mantell Collection. 



2271. An imperfect posterior marginal ; from Cuckfield. 



Mantell Collection. 



2289. Slab of sandstone showing portions of two costals of a large 

 (Fig.) individual, together with the imperfect right humerus ; 

 from Cuckfield. The humerus, of which the distal extre- 

 mity is wanting, is figured by Owen, op. oil. pi. viii. fig. 3, 

 as an ilium. The ventral surface of this bone is exposed ; 

 and the matrix preserves the impression of the dorsal side 

 of the missing distal portion, in which a cast of the ectepi- 

 condylar groove is distinctly seen. This humerus re- 

 sembles that of Chelys (fig. 1, B) and Parachelys (infra), 

 and is totally different from the type of humerus referred to 

 the Aciclielyidaz (fig. 1, A). The femur figured by Owen, 

 op. cit. pi. viii. fig. 2, as that of the present form, is from the 

 London Clay (supra, p. 63, No. 1603). Mantell Collection. 



2268. The imperfect left hyoplastral ; from Cuckfield. The type of 

 (Fig.) Platemys diosoni ; figured by Owen, op. cit. pi. ix. fig. 3, 

 the figure being drawn the wrong way upwards. This 

 specimen agrees in all characters with the next. 



Mantell Collection. 



2313. Slab showing the ventral aspect of a less imperfect hyoplas- 

 tral ; from Cuckfield. This specimen, although broken 

 into several fragments, shows the contour of the whole 



PART III. O 



