AND AVES OF NORTH AMERICA. 



157 



BOTHREMYS, Leidy. 



Cretaceous Reptiles, p. 110-113, which differs from Podocnemis as Chelys does from 

 other Hydraspidffi, *". e., in having an osseous vomer. This is, however, only a generic 

 character. Its characters are more fully pointed out under Euclastes, while we refer to 

 Leidy's excellent description and figure for other details. 



BOTHREMYS COOKII, Leidy. 



Is only known from a oraniuro from the Cretaceous Green Sand of G-louoester Co., N. J. It, is in unusually 

 good preservation, but lias not yet been associated with its carapace and other elements. It will probably be found 

 to belong to cither the following genus, or Prochonias, in whioh case the latter becomes a synonyme. 



Probably to the Podocnemididas also is to be referred the new genus. 



TAPHROSPHYS, Cope. 



American Naturalist,. 18(10, 90, 



Which presents the characters of Podocnemis in several respects. It has like it an 

 inter-marginal sternal hone on each side, which does not extend to the median line, as in 

 Sternothaerus. The other characters axe as follows : 



Ischium, with a small attachment on the posterior margin of the xiphisternal bone ; 

 pubis, with a linear attachment on the same, each well separated from the other. Ilium 

 received into a (Use]), elongate pit on the last two costal elements of the carapace. Antero- 

 external angle of the hyostcrnal bone received into a strong pit near the margin of the 

 first costal. Postero-superior or inguinal prolongation of the hyposternal received into a 

 deep linear groove of the corresponding costal bone. Intergular dermal plate, intermar- 

 ginal ; nuchal plate, none. 



The marginal bones at the sterno-costal bridge have somewhat expanded margins, 

 though their inferior aspect is not in tins plane of the sternum. This point, and the ab- 

 sence of the nuchal scute, are points of resemblance to Podocnemis. The latter genus 

 differs in having a marginal intergular and round pubic suture scar. The anterior or nu- 

 chal marginal bone is much larger than the first or second lateral, and is opbyriform. 

 being much wider behind than at the margin. The vertebral bones are continued to be- 

 tween the costal bones which support the ilia, in one example of T. molops only. Then; 

 are strong vertical inguinal and axillary supports of the carapace, which tire transverse 

 continuations of the hyo- and hyposternal bones in those positions, and their articulations 

 with the carapace are by a, strong gomphosis. 



In this genus, as well as in Podocnemis, the attachment of the marginal bones to the 



AMERICA. IMIILO. 800 VOL. XIV. 40. 



