TESTUDINin/E. 



Ill 



Emyi carteri. A still larger and nearly complete plastron was correctly identified; likewise 

 a portion of a carapace of another individual, including the neurals and the proximal portions 

 of most of the costals. Some of the materials obtained by Dr. Leidv exemplify the great varia- 

 tion found in the form of the anterior lip. Protessor Cope in the same year, 1871, discovered 

 se\ era! specimens which he recognized as belonging to Leidy's species; but he gave no extended 

 description and no figures. Under the name Hadrianus octonarius he described and figured 

 a large and nearly perfect shell which is now in the U. S. National Museum. For reasons 

 given below this is referred by the present writer to H . corsoni. 



Besides the specimens described by Dr. Leidy and Professor Cope, a number of other well- 

 preserved shells have been discovered. One of the largest of these is now in the museum ot 



m- 474- 



Figs. 473475. Hadrianus corsoni. Carapace and plastron. 



X, 



475- 

 No. '.027 A. M. N. H. 



473. Carapace. 



474. Rear of carapace, c. />. 7, seventh costal; . 8, eighth neural; 



spy, I, spy. 2, first and second suprapygals; py, third suprapygal. 



475. Plastron. 



Princeton University, and will be referred to again. During the summer of 1903 the American 

 Museum expedition to the Bridger Eocene, in the region east of Fort Bridger, collected 2 

 more or less complete turtles ot this species. One of these, No. 6027, furnishes the following 

 description: 



The plastron is almost wholly uninjured. 1 he carapace lacks a little of the anterior margin, 

 some portions of the bridge peripherals, the pygal, a part of the eleventh peripheral, and the 

 right peripherals behind the axillary notch, except the tenth and a part of the eleventh. The 

 shell appears not to have suffered any considerable depression during fossilization. 



The length of the carapace (plate 60; text-fig. 473) in a straight line from the front to the 

 rear is 590 mm.; its greatest width close to 455 mm.; its greatest height, which is toward the 

 rear, 215 mm. The border in front is between rounded and truncate; behind, the outline is 

 broadly rounded. The peripherals over the limbs are slightlv flared; the pygal region seems 



