KMYDIDiE. 



29I 



catalog numbers 6019, 6020, 6024, and 6029. The level from which these were obtained is 

 that known as horizon B. No. 6029 is taken as the type of the species. 



The portions of the skeleton presented by the specimens bear such close resemblance to 

 the corresponding parts of Clemmys muhlenbergi that the species is referred provisionally to 

 that genus. 



The type furnishes most of the anterior lobe of the plastron, a portion of the hinder lobe, 

 a part of the nuchal, parts of the right first, second, and third peripherals, and the whole free 

 border of the left second peripheral. The nuchal (fig. 359) was about 19 mm. wide along the 

 free border and about 32 mm. wide at the maximum. The front border is acute-edged, but 

 the bone grows rapidly thicker until, at a distance of about 12 mm. behind the free border and 

 near its articulation with the peripheral, it is 9 mm. thick. On the under side of the bone, at 

 a distance of 15 mm. from the free border, behind the portion covered with horn, the thickness 

 becomes suddenly reduced to 5 mm. The free edge of the first peripheral is acute next the 

 nuchal. The second peripheral has a length of 16.5 mm. along the free border. This is very 

 obtuse, especially where it joins the third peripheral. The greatest thickness of this peripheral 

 is 9 mm. On the under side, at a distance of 12 mm. from the free edge, the thickness is 

 abruptly reduced to 3 mm. The nuchal scute is 9 

 mm. wide posteriorly and about 6 mm. long. The first 

 marginal scute had a fore-and-aft extent, or height, of 

 12 mm. at the distal end. The second marginal at its 

 distal end on the second peripheral was narrowed 

 down to 7 mm. in height. The height of the third 

 was 'about 10 mm. at the distal end. On the lower 

 side of the nuchal and of the peripherals the horny 

 scutes extended backward as far as the thickened part 

 of the bones continued. 



FlGS. 359 and 360. Clemmys morrisiaz. Portions of 

 carapace and plastron of type. X. Known por- 

 tions inclosed within solid lines. 



350. Restoration of front of carapace. 

 360. Restoration of plastron. 



The anterior lobe of the plastron (plate 45, fig. 1 ; text-fig. 360) had a width of about 65 

 mm. Seen from below (fig. 360), the lobe is convex in every direction. The lip projects 

 extremely little. Its width, measured between the gulo-humeral sulci, is 29 mm. The ento- 

 plastron has a width of 25 mm. Its length can not be exactly determined, but it probably 

 little exceeded 25 mm. In form, so far as preserved, it resembles that of C. muhlenbergi. 

 The <rular scutes overlap only slightly the front of the entoplastron. Their length on the midline 

 is 19 mm. The humerals measure on the midline 14 mm. The pectorals overlapt the hinder 

 end of the entoplastron. The whole free border of the anterior lobe is acute, including the lip. 



Plate 45. fi<;. 1. represents the anterior lobe as seen from above. From the free border of 

 the lip the epiplastrals are thickened backward a distance of 20 mm., attaining a thickness of 

 1 2 mm. This is then suddenly reduced to 7 mm., forming an overhanging and somewhat 

 excavated ledge. The sides of this thickened surface are swollen and ornamented with ridges 

 and grooves, the marks of the growth of the gular scutes. Similar markings are seen on the 

 epiplastrals of C. muhlenbergi. The portions of the gular scutes on this superior surface are as 

 wide behind as at the free border. The thickness of the epiplastrals, where they articulate 

 with the hvoplastrals, is reduced to " mm. 



