O. C. Marsh — Notice of some Extinct Testudinata. 179 



the name Emys beatus* but the present form may be distin- 

 guished by the deep distinct pits which mark the whole 

 external surface. 



The plastron shows evidence of an intergular plate, and 

 inframarginals. There is no mesoplastron. 



The nearest living form is probably Dermatemys, from 

 Central America. 



The present specimen is from the Cretaceous of New Jersey. 



Testudo brontops, sp. nov. 



The present species includes the largest. American tortoises 

 known, living or extinct. The type specimen, represented on 

 Plate Till, one-twelfth natural size, is not more than one-half 

 as large as some seen by the writer in the Miocene of Dakota, 

 near the base of the Brontotherium beds. They were sur- 

 passed in size only by the gigantic forms from the Pliocene of 

 India. 



The present species is very nearly related to the recent 

 Testudo elephantopus, Harlan, from the Galapagos islands, 

 and to the huge forms from Madagascar. It differs from the 

 former in the presence of a nuchal plate, and from both, in 

 the long median suture between the first marginal plates. 

 The anterior portion of the plastron, moreover, projects con- 

 siderably in front of the carapace. Other distinctive features 

 are shown in the iigures. 



The specimen here described was secured by Mr. J. B. 

 Hatcher, from the lower Miocene of Dakota. 



New Haven, Conn., July 18th, 1890. 



Explanations op Plates. 

 Plate VII. 

 Figure I. — Skull Glyptops omaius, Marsh; top view; natural size. 

 Figure 2. — Carapace of same species; top view; one-fourth natural size. 

 Figure 3. — Carapace of Adocus punctatus, Marsh ; top view ; one-eighth 

 natural size. 



Plate VIII. 

 Figure 1. — Testudo brontops, Marsh; frout view. 

 Figure 2. — The same specimen ; top view. 

 Figure 3. — The same ; bottom view. 



All the figures are one-twelfth natural size. 



* Cretaceous Reptiles, page 107, Plate XVIII, figure 1, 1865. 



