28 



TRANSACTIONS OF THE WAGNER FREE 





. 57 mm 



. 



72 " 





. 37 " 



. 



23.5" 





. 21 " 



. 



. 38 " 





. 50 " 



• 



20 " 





. 30 " 



Length of nuchal plate in median line, 

 Breadth " " " at lateral angles, . 



" " " " at anterior extremity, 



" " " " at posterior border, 



Thickness at the first marginal suture, . 

 Length of first vertebral scute impression, 

 Breadth of " " .« « _ _ 



Length of nuchal scute impression, . 

 Breadth of first marginal scute impression, . 



12. Fragments of the carapace and plastron of one or two species of 

 Trionyx, undetermined. 



13. Remains of a huge Tortoise with a very thick shell, estimated to have 

 been about five feet in length, presented by J. F. Le Baron to the Smith- 

 sonian Institution. They consist of a number of fragments of the shell and 

 some of the limb bones of one individual mingled with a few fragments of 

 the shells of two others. A number of the specimens are so imperfect that 

 I have failed to correlate them. 



A single vertebral plate, of greater breadth than length, is hexagonal, 

 with the exterior surface rugose and porous, but not sculptured. A strong 

 carina beneath marks its conjunction with the corresponding vertebrae. Its 

 measurements are as follows : 



150 mm 



100 





no 





30 





50 





100 





Greatest breadth between the lateral angles, 



Breadth at the anterior border, ...... 



Breadth at the posterior border, ..... 



General thickness, ......... 



Depth at the median carina, ...... 



Length fore and aft in the median line, ..... 



Of two fragments of costal plates one is 135 mm. wide fore and aft and 

 is 25 mm. thick. 



A large marginal plate is everted and has a thick, obtusely rounded free 

 border, rugose or much eroded in the specimen. Its upper surface forms 

 a continuous concave curve from the inner to the outer border, and is 

 crossed about the middle by a groove defining the investing scutes. The 

 under part of the plate is concave above, and convex below where marked 

 by the scutal areas. The measurements of the specimen are as follows : 



Breadth in a straight line transversely above. 

 Breadth fore and aft at the outer border, 

 Breadth of the scutal border transversely beneath. 

 Thickness toward the outer border, 

 Thickness of the upper or inner border, 



230 mm. 



140 " 

 170 " 



55 " 

 22 " 



