. Carnegie Institution of Washington publication. 54^ FOSSIL TURTLES OF NORTH AMKRR'A. the midline is 132 mm.; the extreme width is 1 17 mm. The carapace (fig. 699) is moderately convex. I he anterior holder is broadly rounded; the hinder border is excavated. There were originally 6 neural bones, ot which the first is injured and the fourth is missing. The first had a length of 21 mm. and a width of 10 mm. The others are shorter and narrower. The nuchal has a fore-and-aft extent ot 18 mm. and a length of 66 mm. from side to side. There are only 7 pairs of costals. Those of the seventh pair mee
. Carnegie Institution of Washington publication. 54^ FOSSIL TURTLES OF NORTH AMKRR'A. the midline is 132 mm.; the extreme width is 1 17 mm. The carapace (fig. 699) is moderately convex. I he anterior holder is broadly rounded; the hinder border is excavated. There were originally 6 neural bones, ot which the first is injured and the fourth is missing. The first had a length of 21 mm. and a width of 10 mm. The others are shorter and narrower. The nuchal has a fore-and-aft extent ot 18 mm. and a length of 66 mm. from side to side. There are only 7 pairs of costals. Those of the seventh pair meet at the midline. The costals are about 3 mm. in thickness. The sculpture of the specimen agrees with that ot the type, but it is more feebly developt. The surfaces of the neurals and the proximal ends ot the costals present shallow pits arranged irregularly. Of these pits there are from 5 to 7 in a line 10 mm. long. Toward the distal ends of the costals the pits become smaller and more closely packt, there being about 10 in a 10 mm. line. The greater portions of both hyoplastra and both hvpoplastra accompany the carapace. There was a considerable fontanel between the hvpoplastrals in front and the xiphiplastrals behind. The mesial half ot the hyoplastra and of the hypoplastic are only 3 mm. thick; but the thickness is somewhat greater near the distal ends of the bones. The bridges are 26 mm. wide. The length of the hvohypoplastral suture is 61 mm. The sculpture of these bones is greatly like that of 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, Carnegie Institution of Washington
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