32 



CHELONIA. 



42997. Slab showing the occipital and palatal aspects of the imper- 

 fect hinder portion of the cranium. The palatines, the 

 left quadrate, and the bones surrounding the foramen 

 magnum are well preserved. The general features are 

 similar to those of C. imbricata, more especially the posi- 

 tion of the epipterygoid processes. The form of the 

 exoccipitals and opisthotic and the contour of the notch 

 forming the posterior aperture of the otic canal are essen- 

 tially the same as in existing species of Chelone, as distinct 

 from Thalassochelys. 



42910-11. A split slab showing the imperfect carapace. Figured 

 {Fig.) by Winkler, op. at. pi. xiii. figs. 42, 43. Nearly the 

 whole outline is displayed ; and there remain most of the 

 bones of the posterior portion, part of the nuchal, the 

 anterior neurals, and the corresponding costals of the left 

 side. Since this specimen agrees in relative size with 

 the undermentioned pelvis, it would appear to indicate 

 an approximately adult individual. 



42915. Slab showing the dorsal aspect of the anterior and median 

 regions of the carapace. This specimen shows part of the 

 nuchal, the anterior neurals, two of the costals, and some 

 marginals. 



42965 a. Slab exhibilSng the dorsal aspect of the anterior part of a 

 large carapace. The nuchal, the first neural, and the 

 anterior marginals are exhibited. 



42899. Slab exhibiting on one side the dorsal aspect of the posterior 

 (Fig.) extremity of the carapace, and on the other the ventral 



aspect of several caudal vertebrae "Figured by Winkler, 



op. cit. pi. xiv. figs. 44, 45. 



42896. Slab showing the dorsal side of a slightly imperfect neural 



bone. 



40173. Slab showing the dorsal side of a neural, and the ventral 

 side of an imperfect costal. Purchased, 1865. 



42965. The anterior extremity of the left side of the carapace, with 

 part of the dorsal surface concealed by matrix. 



R. 921. The nearly entire nuchal, with the ventral surface embedded 

 in matrix. No history. 



42897. A lateral marginal. 



42898. A marginal, with the cavity occupied by matrix. 



