402 FOSSIL TURTLES OF NORTH AMERICA. 
the Cypress Hills, Assiniboia. These costals are remarkable for their thickness, the deeply 
imprest sulci, and the strongly markt lines of growth of the horny scutes. 
Figs. 6 and 7 of plate 66 represent the distal half of the left fifth costal, which is taken by 
Mr. Lambe as the type of the species. Fig. 6 shows the outer surface. Thisi is 12 mm. wide at 
the upper end, 10 mm. at the lower. It might be taken for the bone of a young animal were 
it not for the great thickness. The anterior sutural border has a thickness of a little more than 
4mm. From this border the bone thickens rapidly, so that the posterior border, at the lower 
end of the bone, is 8 mm. thick. Seen from the inner surface (fig. 7) the bone presents, on the 
hinder half of its width, a prominent half-ridge, which was evidently completed on the succeed- 
ing costal. The larger portion of the ridge has been on the sixth costal, and has been developt 
to receive the inguinal buttress of the plastron. It looks indeed as if this buttress had ascended 
about 15 mm. above the border of the costals and had been articulated with both the fifth and 
the sixth, but principally with the latter. So far as the writer is aware, in other species of T estudo 
the buttress articulates only with the sixth 
costal. At the lower end of the fifth costal is 
a pit for a process of the seventh peripheral. 
It is evident that this costal was much broader 
at the proximal end than at the distal. 
There is present a portion of the left first 
costal plate (fg. 506). In this figure the 
upper border was directed toward the head, 
the right hand border toward the first neural. 
At the upper end the fore-and-aft width of 
Fics. 506-508.—Testudo exornata. Costals the bone was about 30 mm. From this it 1s 
of type. XT. estimated that the length of the carapace was 
506. Fragment of first costal. about 200 mm. At its posterior border the 
507. Proximal end of sixth costal. 
508. Proximal half of third or fifth costal. bone ue 4-5 wanlonk thick, On the iabaKee EAU 
face is a ridge which past upward into the 
head of the rib. The outer surface of the bone 1s ane by the lines of growth of the 
first costal scute. Fig. 507 represents the outer surface of the proximal end of another costal, 
probably the sixth costal of the left side. Where the bone joined the sixth neural it is 8 mm. 
thick. The sulci are narrow, but deeply imprest. The outer surface shows the lines of 
growth of the scutes. At its upper end the bone is 15 mm. wide and appears to have expanded 
toward the distal end. 
Fig. 508 represents a costal of a young individual, evidently the third or the fifth, probably 
the fifth of the right side. The width at the upper end is 12 mm. The width at the distal end 
of the fragment, probably about the middle of the length of the costal, has increased to g mm. 
Its thickness is a little more than 3 mm. On the under side of the bone is found the base of a 
rather well-developt rib-head. 
Testudo laticunea Cope. 
Plate 67, figs. 1, 2; text-figs. 509-515. 
Testudo laticunea, Corr, Paleont. Bull. No. 15, 1873, p. 6; Synop. New Vert. Tert. Colorado, 1873, 
p- 19; Ann. Rep. Geol. oe Surv. Terrs., 1873 (1874), p. 511; Vert. Tert. Form. West, 1884, 
pp- 762, 765, plate Ixi, figs. 1, ta.—Hay, Bibliog. a Cat. Foss. Vert. N. A., 1902, p. 451. 
In his original description Professor Cope states that he had in his possession several speci- 
mens of this species, but he does not designate any as the type. In his description of 1884 one 
individual in a good state of preservation was used as the basis of the description and was 
heured. ‘This must now be regarded as the type, especially since the other specimens occur- 
ring in the Cope collection are very fragmentary. This type is now in the American Museum 
of Natural History and bears the ts 1160. All of Cope’ s specimens were obtained in the 
Oligocene beds at the head of Horse Tail Creek, in northeastern Colorado. These deposits 
belong to the level known as the Oreodon beds. 
The specimen is slightly distorted, somewhat fractured, and some portions are missing. 
A fracture extends along the midline of the anterior part of the carapace and the elements of 
