First marginal scute: Length of margin bordering 2d marginal, 15 (L),
14; length of anterior margin, 15 (L); length of posterior margin, 14
(L); length of inner margin, 13 (L); length of outer margin, 23 (L).
Third marginal scute: Length of anterior margin, 14 (L). Eighth marginal
scute: Length of anterior margin, 15 (L), 15; length of posterior
margin, 16 (estimate of L), 16; length of inner margin, 20 (L), 20;
length of outer margin, 25 (estimate of L), 25. Ninth marginal scute:
Length of anterior margin, 17 (L), 16; length of posterior margin, 17
(L), 17; length of inner margin, 18 (L), 20; length of outer margin, 21
(L), 21. Tenth marginal scute: Length of anterior margin, 17 (L), 17.
Eleventh marginal scute: Length of posterior margin, 14 (L).
First costal scute: Length of margin bordering vertebrals, 45. Second
costal scute: Length of margin bordering vertebrals, 35 (L), 35; length
of margin bordering 3d costal scute, 52.
First vertebral scute: Length of anterior margin, 24 (estimated);
greatest width, 32 (estimated); length at midline, 35 (estimated).
Second vertebral scute: Length of anterior margin, 27; greatest width,
42; length at midline, 29. Third vertebral scute: Length of anterior
margin, 33; greatest width, 42; length at midline, 40 (estimated).
Pectoral scute: Length of humero-pectoral sulcus from midline to outer
border, 38; length of margin of pectoral scute on midline, 18; distance
between junction of humero-pectoral sulcus and outer border and point
on pectoro-abdominal sulcus equidistant from midline, 19; distance from
axillary notch to point on pectoro-abdominal sulcus equidistant from
midline, 17.
Abdominal scute: Length of margin of scute on midline, 43; width of
posterior border of abdominal scute from midline to inguinal notch, 41;
distance from inguinal notch to a point on pectoro-abdominal sulcus
equidistant from midline, 44.
Femoral scute: Length of border of scute on midline, 24; width of
anterior border of scute from midline to inguinal notch, 41; width of
posterior border of scute from midline to outer border (along sulcus),
40; length of outer margin of scute from inguinal notch to femoro-anal
sulcus, 46.
Anal scute: Length of margin at midline, 36; length of femoro-anal
sulcus, 40.
_Remarks._--Noteworthy is the intermediate nature of _C. limnodytes_
when compared with species of the genera _Chrysemys_ and _Pseudemys_.
However, any resemblance to _Pseudemys_ is not to be considered as
evidence that _C. limnodytes_ is in any way ancestral to the genus
_Pseudemys_. The fossil specimens of _Pseudemys_ from the Pliocene are
too poorly known to allow the student certainly to place them in their
correct systematic positions. The fossil Emydids from Western Europe,
listed as species of _Chrysemys_, differ very much from this species, or
belong to other genera of the family.
Only a few turtles are known from the Laverne formation. Hesse (Chaney
and Elias, 1936) reported a small _Testudo_ from the Laverne of Beaver
County, Oklahoma, but neglected to state whether it was among the
material borrowed by him from the University of Kansas Museum of Natural
History. The Museum has an incomplete carapace and plastron (No. 3101)
of a small _Testudo_ from that locality and formation. In Harper County,
Oklahoma, the field party from the University recovered a large number
of fragments of a large _Testudo_. Although this specimen is as yet
unprepared, enough fragments have been pieced together to reveal that
the tibia is 127 mm. long. This dimension and those of some of the
fragments indicate that the animal may have been four to five feet long.
Mrs. Bernita Mansfield of the Geology Department, University of Kansas,
prepared the plate.