. Carnegie Institution of Washington publication. 462 FOSSIL TURTLES OF NORTH AMERICA. costo-marginal sulcus. Where thickest, at the line where on the inner surface the horny scute met the soft skin, the bone is 45 mm.; elsewhere from 22 mm. to 30 mm. Considering the great thickness of the neurals and costals we might expect the peripherals of T. crassiscutata to be thicker than is the bone here described. Testudo laticaudata Cooe. Figs. 623, Testudo laticaudata, Cope, Geol. Surv. Texas, iv, 1903, reprint p. 75, plate xxii, fig. I.—Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 451.
. Carnegie Institution of Washington publication. 462 FOSSIL TURTLES OF NORTH AMERICA. costo-marginal sulcus. Where thickest, at the line where on the inner surface the horny scute met the soft skin, the bone is 45 mm.; elsewhere from 22 mm. to 30 mm. Considering the great thickness of the neurals and costals we might expect the peripherals of T. crassiscutata to be thicker than is the bone here described. Testudo laticaudata Cooe. Figs. 623, Testudo laticaudata, Cope, Geol. Surv. Texas, iv, 1903, reprint p. 75, plate xxii, fig. I.—Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 451. The type of Cope's T. laticaudata consists of a nearly entire right epiplastron, said by Cope to be the left, and the greater part of the right xiphiplastron. These remains were found by Prof. W. F. Cummins, of the Texas Geological Survey, in the Equus beds, on Rock Creek, opening into Tule Canyon, in Briscoe County, Texas. These bones are now in the Univer- sity of Texas, where the writer has been permitted to examine them. The form of the anterior lobe of the plastron, as far backward as the hyoepiplastral suture, can be seen from Cope's figure here reproduced. The width ot the lobe at the suture mentioned was very close to 205 mm. The epiplastral lip was very slightly set off from the remainder of the lobe and was rounded and slightly tootht in front. The lower surface of the bone is in general flat, but on the lip there are two broad shallow fossae. The free border is acute posteriorly, less so in front of the gulo-humeral sulcus. Along the epiplastral symphysis the bone thickens rapidly (fig. 624) rising to a height of about 42 mm. It then descends. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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