146 



As peculiarities of the Ibssil, tiie fourth vertebral plate is octagonal, and 

 the fifth one in consequence quadrate. 



The second and third vertebral scute-tracts are much longer than wide, 

 and proportionately much longer than in the former specimens. The anterior 

 division of the second vertebral scute forms three sides of a square ; and the 

 posterior groove defining the third scute crosses the sixth vertebral plate 

 instead of the fifth as in the other specimens. 



The peculiarities indicated in the fossil under examination I regard as being 

 of an individual character and in some degree anomalous. 



A fragment of the fore part of the plastron accompanying the specimen 

 referred to E. Haydeni, and apparently belonging to the same individual, 

 resembles the corresponding part in the specimens previously described, but 

 is not notched at its anterior truncated border. 



6. Another specimen, referable to Emys wijomingensis, consists of a nearly 

 complete shell except the posterior third of the carapace. It was discovered 

 by Dr. Carter in the bluffs of the Cottonwood, seven miles from Millei'sville, 

 in the vicinity of Fort Bridger, Wyoming, and presented by him to the 

 Academy of Natural Sciences of Philadelphia. It is occupied in the interior 

 with a greenish-gray sandstone, including indurated clay pebbles. In form 

 and size it approaches closely the specimen first referred to Emys Jeanesi. 

 In the forni and proportions of its vertebral scute impressions it more nearly 

 resembles the specimen originally referred to E. Haydeni. The intermediate 

 ones are, however, more strongly double sigmoid at their lateral borders; the 

 fore part of the second vertebral scute is less square; and the anterior border 

 of the third is strongly bowed forwarxl instead of being nearly straight. 



An accidental fracture of the specimen across the posterior third exposes 

 to view the lateral supports of the carapace ascending from the plastron. 

 These are much wider than in any of the living emydes, and approach in their 

 proportions those of the living fresh-water turtle Batagur, of India. 



7. A seventh specimen oi E. wyomingensis consists of an intermediate ])or- 

 tion of a carapace and nearly the whole of the sternum. It was obtained by 

 Dr. Carter in the vicinity of Fort Bridger, and presented by him to the 

 Academy of Natural Sciences of Philadelphia. 



The vertebral plates of the carapace are in general of proportionately greater 

 l:)readth in comparison with the length than in the former specimens, and in 

 this respect most nearly approach the one which was referred to E. Hay- 



