350 FOSSIL TURTLES OF NORTH AMERICA. 
number of longitudinal grooves, which mark the growth of the scutes. The deepest ones are 
from 5 to 7 mm. apart and appear to indicate the yearly increase in size. On each peripheral 
behind the bridge we find in front of the sulcus crossing it some strong grooves parallel with 
the free border of the shell; behind the sulcus, some more delicate grooves more nearly parallel 
with the axis of the shell. 
The length of the plastron (plate 55, fig. 2; text-fhg. 452), from the outer anterior angle of 
the epiplastron to the extremity of the xiphiplastron, is 165 mm. In the midline, from the 
hinder border of the entoplastron to the notch in the rear, the length is 142 mm. The width of 
the anterior lobe at the base is gi mm. The entoplastron had a width of 33 mm. 
The bridge has a width of 69 mm. It rises rapidly from the bottom of the plastron. 
The Give: plastral lobe has a length of 75 mm. and a width of go mm. at the base. Near 
the suture between the hypoplastra and the xiphiplastra the width is g6 mm. At the end of the 
femoro-anal sulcus there is only a slight notch. The free margins of the plastral lobes, so far 
as preserved, are acute. The extremities of the xiphiplastral bones are rounded and slightly 
dentated. 
The humero-pectoral sulcus crosses the plastron behind the entoplastron. The pectoral 
scutes have a width at the midline of 27 mm.; the abdominals, a width of 22 mm.; the anals, 
a width of 4omm. There are large axillary and inguinal scutes. 
The lower surface of the plastron i is delicately p grooved longitudinally. 
Professor Cope mentions the presence of portions of the seul: but there is little more than 
the left quadrate. It presents no difference when compared with that of 7. rugosa. 
The shoulder-girdle and the limb bones appear to resemble essentially those of the living 
species just mentioned. 
Trachemys euglypha (Leidy). 
Plate 54, fig. 3. 
ee euglypha, Lerpy, Proc. Acad. Nat. Sci. Phila. 1889, p. 97; Trans. Wagner Free Instit., 1, 1889, 
. 27, plate iv, fig. 1.—Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, p. 447. 
The present species was based on a single bone, the nuchal, of a turtle found in the Peace 
Creek beds, Florida. Dr. W. H. Dall, of the U.S. Geological Survey, has examined these 
deposits and pronounct that bed, about 2 feet in thickness, from which vertebrate remains 
have been obtained, to be of older Phocene age. However, since from that bed Dr. Leidy has 
described vertebrates belonging to various epochs, from the Miocene to the present, the correct- 
ness of the determination is in question. The type of the species here described belongs to 
the Wagner Free Institute, Philadelphia, but the writer has not been able to find it there. 
Dr. a eidy has referred his species to the genus Emys; but it can not belong there—as that 
genus 1s understood at present. The nuchal Fecorbles ‘closely that of a specimen of Trachemys 
seripta now in the American Museum of Natural History. From this, however, it differs 
specifically. The length of the bone at the midline is 58 mm. The total length of the carapace 
of the specimen of 7. scripta just mentioned, the length of whose nuchal is 50 mm., is 210 mm. 
We may therefore conclude that the carapace of Dr. Leidy’s type had a length of about 
290 mm. The width of the front of the nuchal is 37 mm., the greatest width 73 mm. This 
border is deeply notcht, but the bottom of the notch is divided by. the projection into it of the 
area occupied by the nuchal scute, which is 11 mm. wide. T he thicknesseof the bone at the 
articulation with the first peripheral is 21 mm.; at the articulation with the first neural, 6 mm. 
The nuchal of the specimen of 7. scr:pta mentioned has a maximum thickness of only 10 mm. 
a fact showing that 7. ewglypha had a shell much thicker and heavier than that of the living 
species. The width of the border which articulated with the first neural is 23.5 mm. 
The scutal sulci are deeply imprest. The nuchal scute has a length of 20 mm. and a width 
of 10 mm., its lateral borders being parallel. That part of the first vertebral scute which lies 
on the nuchal bone is 38 mm. long: Measured anteriorly between the points where the lateral 
sulci of the vertebral ] join the costo-marginal scutes, the width of the first vertebral is 34 mm. 
Measured posteriorly, where the intemal sulci pass on to the first costals, the width is 50 mm. 
The upper surface of this bone is strongly sculptured, resembling somewhat that of 7. 
scripta, but ridged and grooved more boldly. 
