94 CHELONIA. 



Stylemys nebrascensis, Leidy \ 



Syn. Testudo nebrascensis, Leidy 2 . 



Testudo hemisphcerica, T. oiveni, et T. lata, Leidy - . 



The type species. Carapace much depressed, with all the neurals 

 hexagonal ; vertebral shields not wider than costals. Length of 

 shell averaging 0,305 to 0,406 (12-16 inches). The whole of the 

 above-mentioned forms are identified by their describer with this 

 species. Stylemys culbertsoni (Leidy 4 ), which is also regarded by the 

 same writer as indistinguishable, has the 2nd neural octagonal, and 

 the 3rd small and approximating to a tetragonal form. 



Hob. North America. 



29676. The imperfect shell; from the Miocene of the White River, 

 Nebraska. The carapace is broken off across the middle 

 of the 4th vertebral shield, and the greater part of the 

 xiphiplastrals is also w r anting. This specimen agrees 

 closely with the type shell figured by Leidy in the 

 ' Smiths. Contrib. Knowl.' vol. vi. art. 7, pi. xix. The 

 contour of the neural bones is, however, not shown. 



Purchased, 1855. 



Stylemys, sp. 



Very imperfectly known, but apparently closely allied to the 

 American forms. This species is probably identical with one of 

 the insufficiently described Tortoises recorded by Lartet 3 from 

 Sansan under the names of Testudo canetotiana, T. frizaciana, and 

 T. pygmcea. 



Hob. Europe (France). 



21873. The anterior extremity of the shell, with the carapace 

 crushed ; from the Middle Miocene of Sansan (Gers), 

 France. The portion of the carapace shows part of the 

 nuchal, the anterior marginals, and part of the 1st costals. 

 The plastron is entire in advance of the suture between 

 the hyo- and hypoplastrals. The contour of the plastron 

 agrees so closely with that of Stylemys, as exemplified in 



1 Proc. Ac. Nat. Sci. Philad. for 1851, p. 173. 2 Ibid, for 1852, p. 59. 



3 See Smiths. Contrib. Knowl. vol. vi. art. 7, pp. 105-110 (1854), and Eep. 

 U. S. Geol. Surv. Terrs, vol. i. pt. i. p. 339 (1873). The names date from 1851. 



4 See Smiths. Contrib. Knowl. op. oil. pi. xxii., and Eep. U. S. Geol. Snrv. 

 Terrs. /. c. 



5 See Gervais, Zool. et Pal. Franchises, 2nd ed. p. 437. 



