CHAPTER XIII. 
THE FOSSILS OF THE LOUP FORK EPOCH, 
REPTILIA. 
TESTUDINATA. 
TESTUDO, Linn. 
Testudo undata, Cope. 
Plate Ixvii, figs. 1-2. 
Ann. Eept. Chief of Engineers, 1875, ii, p. 994. 
Two species of Tortoises occur in association with the fauna described 
in the following pages, but their remains are mostly found in a fragmentary 
condition. Hence, although I procured nearly all portions of the skeleton, 
in no case do they belong to a single individual. None of the fragments 
belong to species of any other genus, unless it be Stylemys. I possess the 
caudal vertebrae and a metapodial bone of one of the species recognized, 
and the latter indicates in the clearest manner that it is a Testudo. It is 
wider than long, and totally different from the elongate metapodials of 
Stylemys. As already pointed out, these have the form characteristic of the 
Emydidce, to which family the genus is to be probably referred. The caudal 
vertebrae are few and short, and have the procoelian character. They are 
without chevron-bones. 
The greater part of a plastron was obtained, which I describe here, as 
it cannot be definitely referred to its proper species. It is quite thin me¬ 
dially, as in various Testudos, and is not much thickened within the fore 
border, as is the case in many species of that genus and of Hadrianus. The 
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