Mr. J. Z. Gilbert ll has described the skull of a species of Testudo from the Loup Fork beds of Kansas and identified it with Prof. Cope`s T. undata, described * from the Loup Fork deposits of New Mexico. Since nothing is known of the latter species except a few marginals and a costal bone, there is really no evidence that the fine skull described by Gilbert belongs to T. undata. The probabilities are greater that it belongs to one of the species described by Prof. Copet from the Loup Fork beds of Kansas, Testudo orthopygia and T. cyclopygia. Ut T. orthopygia Prof. Cope possessed most of the skeleton including the skull. A comparison of Mr. Gilbert's figures and description with the description of Prof. Cope makes it pretty certain that the former is not identical with T, orthopygia. Of T. cyclopygia the skull is not known, and we have no means of comparing it with Mr. Gilbert's species. This being the case, it is better, I believe, to give the latter a distinct name. so that its literature may be kept separate until further discoveries demonstrate its relationship to other described forms.

* The Kenabeek, the great serpents,

Lying huge upon the water.

Sparkling, rippling: un the water,

Lying coiled across the passage,

With their blazing crests uplifted. --Longfellow's Hiawatha. †Proc. Acad. Nat. Sci. Phila., 1876, p. 341.

‡Proc. Amer. Phillis. Soc., vol. XXX, p. 140.

§ Tcrtiary Vertebrates, p. nó, pl. XV, figs. 1 - 12.

Kansas Univ. Quart., vol. VII. p. 143, with 4 text-figures.

I name it in honor of its describer Testudo gilbertii.