TESTUDINATA. 
285 
Length of the free margin of three consecutive posterior marginal bones. 0. 310 
Length of the last marginal bone. . .. 0.122 
Width of the last marginal bone.. 0.135 
Thickness at the middle . .. 0.017 
Thickness of the bridgeward suture of a lateral marginal. 0. 040 
Thickness of the opposite suture of the same.... 0. 015 
Fragments of other specimens, probably of this species, present still 
larger proportions. 
As compared with the two described species of Stylemys, this species 
differs in the strong flaring and recurvature of its marginal bones, and 
in the more wedge-shaped caudal marginal bone, as well as its much 
larger size. 
Testudo klettiana, Cope. 
Plate Ixvii, fig. 3. 
Ann. Rept. Chief of Engineers, 1875, ii, p. 995. 
Indicated especially by a caudal marginal bone of a Tortoise of larger 
size than the one regarded as typical of the T. undata. It is, of course, 
probable that some of the fragments above described without especial ref¬ 
erence, belong to it. The caudal bone differs from that of. T. mtZato in 
being nearly plane, and thus wanting the recurvature or superior concavity 
of the corresponding bone of that species. Its form is also quite different. 
Its lateral sutures are nearly parallel instead of divergent anteriorly, and 
slightl}^ concave; if a little expanded proximally, it contracts again to the 
suture for the pygal bone. This suture is a' short squamosal on the outside 
of the caudal. The thickness of the bone is almost uniform to near the 
proximal suture; there an abrupt rabbet commences the plane of the thin¬ 
ner pygal. 
Measurements. M. 
Width, proximal .... . 0.105 
Width, distal. 0.110 
Lougth.. 0.110 
Thipkuess..... 0.109 
The free margin is slightly convex. 
Dedicated to Francis Klett, of the United States Geographical Survey, 
to whose interest in paleontology we are largely indebted for the oppor¬ 
tunity of studying the vertebrate fauna of the Loup Fork beds of New 
Mexico. 
