. Carnegie Institution of Washington publication. . 641. Kigs. 640 and 641.—Plastomenus aedenuus. Carapace anil plastron. XJ. No. 5978 A. M. N. H. 640. c arapace. 641. Plastron. }X mm. along the midline. Its hinder border is somewhat excavated for the preneural. The costals widen toward their distal ends. The free border of each is beveled. The free ends of the ribs are very short. The thickness of the costals is about 5 mm. Those of the sixth pair inclose between their proximal ends the sixth neural; but behind this they join in the midline. The costals of the seventh and eighth pairs also me
. Carnegie Institution of Washington publication. . 641. Kigs. 640 and 641.—Plastomenus aedenuus. Carapace anil plastron. XJ. No. 5978 A. M. N. H. 640. c arapace. 641. Plastron. }X mm. along the midline. Its hinder border is somewhat excavated for the preneural. The costals widen toward their distal ends. The free border of each is beveled. The free ends of the ribs are very short. The thickness of the costals is about 5 mm. Those of the sixth pair inclose between their proximal ends the sixth neural; but behind this they join in the midline. The costals of the seventh and eighth pairs also meet in the midline, the former for a distance of 20 mm., the latter for a distance of 65 mm. The preneural is pentagonal, 24 mm. long, and of about the same width. The first neural is pentagonal, 25 mm. long and 19 mm. wide. The right postero-lateral side is very short, and articulates with the second right costal. The third neural is four-sided, 34 mm. long and 16 mm. wide. The next 3 neurals are hexagonal, with the narrow end forward. The fifth is 13 mm. wide. 1 he last neural is small, 15 mm. long and 6 mm. wide. The sculpture of the surface consists of longitudinal ridges, or welts, and shallow pits. Neither the welts nor the pits are conspicuous. The welts are obsolete on the anterior half of the carapace, most distinct posteriorly. Running longitudinally as they do, they cross the cos- tals of the middle of the carapace at right angles. Posteriorly thev cross the costals obliquely. A close examination of the welts shows that they resemble those of the type of the species. On the last costal they run in the same direction and become resolved into low tubercles, but these are not so swollen as in the 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, C
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