EMYDID&. 291 
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 g 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 g 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 g 
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. 
Fics. 359 AND 360.—Clemmys morrtsta. Portions of 
carapace and plastron of type. 3. Known por- 
tions inclosed within solid lines. 
359. 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 gular scutes overlap only slightly the front of the entoplastron. Their length on the midline 
is 1g 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, fig. 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 
13mm. This is then suddenly reduced to 7 mm., forming an ov erhanging and somewhat 
excavated ledge. The sides of this thickened surface are sw ollen 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 hyoplastrals, is reduced to 7 mm. 
