EMYDID&. 295 
the summit is 18 mm. above the lower face of the bone. Backward, the wall descends, so that 
at the femoro-anal sulcus it is only 10 mm. high and its outer face is not so steep. The length of 
the hypoxiphiplastral suture is 51 mm. The femoro-anal sulcus reaches the free border of the 
bone at a distance of 30 mm. behind the anterior border. 
The originals of Cope’s figs. Ic, 17, and 1g are portions of the central region of the plastron. 
They are about 5 mm. or 6 mm. thick. 
Cope’s fig. 1 represents what to the present writer appears to be the right eighth peripheral. 
It resembles: greatly the corresponding bone of Testudo tabulata. The following are the 
measurements of the bone: 
Millimeters. 
Length along the free border. . spcVegnyslae <a lara.gieeeaubs ve meses ye 6,4 = tee os 
Length along the sutural border supposed t to join n the ninth peripheral........ 2 
Greatest thickness Obthis borderencc ce ucaeant,.s les sete eens ese sscne cs 12 
Length along sutural border supposed to join the seventh peripheral. ....... 37 
Greatest:thicknessyotithis border: 2. Jes. de... sass oe bee se es ee eee te se 15 
Cope’s statement that the greatest thickness is 11 mm. is an error. The border regarded 
as the posterior is convex in outline. Cope thought that this was the anterior border. The 
free border (on the left of Cope’s figure) is acute. The costal border is thickened, rounded, 
and smooth. Evidently it formed no interlocking suture with the costal bones. The sulcus 
(faintly seen in Cope’s figure) turns slightly forward at the free border of the bone. In the 
thinner articular border there is a rough groove which received a ridge on the face of the ninth 
peripheral. On the supposed anterior articular face is a ridge to fit into the next bone. 
Cope’s fig. td represents another peripheral. The free border (on the left of Cope’s figure) 
is acute and 27 mm. long. One sutural border (the lower of the fgure mentioned) is 15 mm. 
thick and 36 mm. long. The opposite border is somewhat damaged but was evidently thinner. 
In the thicker articular face there is a groove instead of a ridge. It is not improbable that this 
is a second peripheral. 
The bone represented by Cope’s fig. 1a is difficult of identification on account of its 
damaged state of preservation. Cope speaks of it as ‘“‘a piece of the inguinal marginal, which 
shows that this species has the fixed anterior lobe of the Emydidz.” Tinctead of “inguinal he 
probably meant axillary. Quite certainly the bone belongs in either the axillary or the inguinal 
region. The form and the great thickness of the border of the hinder lobe and the smooth 
costal borders of the peripherals render it probable that this is rather a species of T estudo 
than of Clemmys. 
Clemmys insculpta (Leconte). 
Testudo insculpta, Leconte, Lyc. Ann., New York, 111, 1830, p. 112. 
Clemmys insculpta, BouLENGER, Cat. of Chelonians, 1889, p. 107——Corr, Jour. Acad. Nat. Sci. Phila. 
(2), x1, 1899, p. 194- 
Professor Cope, as cited in the synonymy, reports the finding of some bones, referred to 
this species, in the Port Kennedy Cave, Pennsylvania. The remains were very fragmentary, 
and there is a possibility that they may belong to some related but undescribed species. 
C. insculpta is yet a living species in the eastern ned States. 
Genus ECHMATEMYS Hay. 
Shell emydoid. Neural plates mostly hexagonal, with the broad end forward. Pygal 
bone short, the transverse sulcus crossing above it on the last suprapygal. Plastron suturally 
articulated with both the peripherals and the costals. Axillary buttresses rising above the 
border of the first costal and articulating with its inner surface. Inguinal buttresses ascending 
above the peripherals and articulating ‘with the inner surfaces of the fifth and sixth costals. 
Usually a well-developt epiplastral lip. Humero-pectoral sulcus usually crossing the ento- 
plastron. Skull not certainly known, but almost certainly emydoid in general structure and 
with the triturating surface of the upper jaw narrow and with no ridge, or a rudimentary one, 
on each side. Choanz well forward. Lower jaw with a narrow triturating surface. 
Type: Emys septaria Cope. 
