Compsemys victus Emys OBSCURUS

Leidy, J., 1860, Extinct vertebrata from the Judith River and Great Lignite formations of Nebraska., Transactions of the American Philosophical Society 11, pp. 139-154 : 152-153

COMPSEMYS VICTUS .

The above name is proposed for a species of turtle, indicated by several fragments of a carapace , obtained by Dr. Hayden, from the Great Lignite Tertiary Basin, near Long Lake, Nebraska. The more characteristic specimens consist of a vertebral plate, and the greater portions of the fifth and last right costal plates.

The vertebral plate, ( fig. 5, plate 11 ,) is about an inch in its antero-posterior and transverse diameters. The fifth costal plate, ( figs. 6, 7, plate 11 ,) is much arched, is an inch and a quarter wide, two lines thick, and when perfect,, appears to have been about four inches long. The fragment of a last costal plate is three lines thick.

Marks upon the fifth costal plate, of the fourth and fifth vertebral scutes, indicate these to have been about two inches in width.

The peculiarity of the specimens which has led to the proposal of the genus, consists in their exterior surface being closely studded with uniform granular tubercles, which give to them a shagreened appearance, quite different from any thing I have had the opportunity of seeing in other turtles Explanation of Figures, Plate 11.

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Figures 5, 6, 7. Fragments of plates of the carapace of Compsemys victus , of the natural size. The carapace represented as partially but ideally restored, with the relative position of the fossil fragments.

Figure 5. A vertebral plate. Figure 6. A portion of a right costal plate.

Figure 7. Marginal view of the same specimen as the last, giving an idea of the curvature of the carapace Emys OBSCURUS .

Figures

1-3. Trionyx foveatus 4.Emys obscurus 5-7. Compsemys victus. 9-19 Crocodilus humilis. 20-23. Lepidotus occidentalis. 24-30 Mylognathus priscus