. Carnegie Institution of Washington publication. TRIO NYC HID.*:. 499 I he neurals arc re. rhe accompanying table shows their dimensions. It is not certain that the outlines of the seventh neural are correctly drawn in the figure; but they appear to be as shown. If so, this neural is of unusual form and size for the posterior one. It did not wholly separate the costals of the seventh pair at the midline. Neural. Length. Width. 3 4 5 6 20 19 17 15 19 18 15 >3 The central portions of the upper sur- face of the carapace are nearly smooth. Gradually toward the outer borders a sculpture appears
. Carnegie Institution of Washington publication. TRIO NYC HID.*:. 499 I he neurals arc re. rhe accompanying table shows their dimensions. It is not certain that the outlines of the seventh neural are correctly drawn in the figure; but they appear to be as shown. If so, this neural is of unusual form and size for the posterior one. It did not wholly separate the costals of the seventh pair at the midline. Neural. Length. Width. 3 4 5 6 20 19 17 15 19 18 15 >3 The central portions of the upper sur- face of the carapace are nearly smooth. Gradually toward the outer borders a sculpture appears. On a band about 35 mm. wide around the borders this sculp- ture is quite distinct and consists of ridges separated by furrows and pits. These ridges run nearly parallel with the free bor- ders of the carapace. The furrows are usually narrower than the flat-topped ridges. A line 10 mm. long crosses four of the ridges. Nassau, an old name for Princeton University. FlG. 653.—Aspideretes nassau. Carapace of type. Partly restored. Aspideretes puercensis sp. nov. Plate 94, fig>. i-;; plate 104, figs. 2, 3; text-figs. 654, 655. This species is represented by a single specimen, which belongs to the American Museum of Natural History, and bears the number 1202. The right side of the carapace is nearly com- plete, lacking only the eighth costal and the free ends of most of the ribs; and there are present large portions of the left side of the plastron. All these parts belonged to a single individual, which was collected by Dr. J. W. Wort- man and Mr. O. A. Peterson, in 1892, in the Puerco beds of New Mexico, probably in the southern part of Rio Arriba County. Up to the present time, no species of Trionychidae has been described from the Puerco Eocene except Con- < hot helys admirabihs Hay. Professor Cope has credited (Proc. Amer. Philos. Soc, xx, p. 461) to the Puerco deposits the Wasatch species Plastomenus communis, but it was with a doubt, and the species was not incl
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