124 



THE EXTINCT BATRACHIA, REPTILIA 



STYLEMYS NEBRACENSIS, Leidy. 



Sli/lemys nebracensis, Emys hemispheriea and E. oweni. Pr. A. N. Soi., Phila., 1851, p, 172. 

 Tettudo nebracensis, Leidy, Ancient Fauna Nebraska, 10;3. T. hemisphairica, T. oweni et T. lata, Leidy 1. c. 

 Tabs, xix, xx, xxi, xxiii, xxiv. 



Miocene Tertiary of Nebraska. 



A specimen of this species presented to the Academy of Natural Sciences by Dr. 

 Hayden measures 20 inches in length, and 15 inches in width. 



STYLEMYS CULBERTSQNII, Leidy. 



Testudo culberisonii, Leidy, Ancient Fauna of Nebraska, Tab. xxii. 



Miocene Tertiary of Nebraska. 



STYLEMYS NIOBRARENSIS, Leidy. 

 Testudo (St.) niobrarensis,, Leidy, Proceed, Ac. Nat. Sci., Phil., 1858, 29. 



Pliocene of the Niobrara river, Nebraska. 



COMP8EMYS, Leidy. 

 I'roc. Ac. N. Sci., 1850, SIS. 



The remains of this genus do not offer any very marked features to distinguish them 

 from Emys. The existence of generic distinction is however suggested by the delicate; 

 areolate sculpture of the surface of the carapace. Costal capitula well developed; verte- 

 bral scuta, subquadrate. 



COMPSEMYS obscurus. 



Emys obscurus, Leidy, Pr. A, N. Sci., 185G, 312. 



From the Upper Jurassic of Long lake, Nebraska. 



COMPSEMY8 VICTUS, Leidy I, v. 

 Upper Jurassic Bad Lands, Judith River, Nebraska. 



CISTUDO, Flem. 

 CISTUDO EURYFYGIA, Cope. 



This extinct species is represented by a portion of the posterior margin of the carapace, whicb Includes more 

 or less of ('our marginal, two vertebral, and one costal, scuta. The relations of the osseous elements are much as 

 in C. clausa; «'. e., the posterior costals are united on the median line, without rudimental vertebral below, and the 

 last vertebral is an irregular pentagon with the two anterior sides elongate. There are traces of angular concentric 

 sculpture as in the existing species, which encloses a slightly angular boss on the posterior margin of the costal 

 scutum. 



What distinguishes this box-tortoise from the existing one, is the greater width of the vertebral SCUta, and I he 

 different form of the marginals. The costal suture of the vertebral, instead of joining a prolongation of the penul. 



