TESTUDINATA. 
71 
close to 46 mm. The extreme width is 57 mm.; the width along 
the anterior border is 32 mm. The greatest thickness in the bor¬ 
der which joined the first peripheral is 11 mm. The bone along 
the anterior border is acute, and this border is notched in the mid¬ 
line. The upper surface of the bone is concave on each side of the 
median rounded keel. This keel is unusually prominent and pro¬ 
jects well forward between the marginals of the first pair. The 
nuchal scute is extremely narrow on the upper surface; but on 
the lower side of the bone it widens posteriorly to 11 mm. The 
front width of the first vertebral scute is 46 mm. It narrows back¬ 
ward as far as the bone extends and was probably urn-shaped. 
The sulci are rather sharply and deeply impressed,. The surface of 
the carapace was probably somewhat uneven. 
PSEUDEMYS FLORIDANA PERSIMILIS, NEW SUBSPECIES. 
Plate 5, figs. 6-8. 
Type-specimen .—A pair of epiplastral bones, No. 7098 of the 
Florida Geological Survey. 
Type-locality and formation. —Vero, St. Lucie County, Flor¬ 
ida. Pleistocene. 
Diagnosis .—Gutter for the neck in the epiplastral lip more 
deeply excavated than in P. floridana and the border immediately 
outside of gular scutes less acute. 
In the collection made by Dr. Sellards at Vero is a pair of 
epiplastral bones which resemble vej-y closely the corresponding 
parts in specimens of Pseudemys floridana. Some differences, pos¬ 
sibly not of great value, appear to exist. In order that these dif¬ 
ferences may be kept in mind and that the literature which may 
accumulate around this fossil form may be in a manner isolated, 
it is thought best to give it a subspecific name. Some of the pe¬ 
culiarities of the epiplastrals (No. 7098) will be seen from the 
figure (pi. 5, fig. 6). The epiplastral lip is 56 mm. wide. The 
width of the anterior lobe at the outer ends of the sutures between 
these bones and the hyoplastrals is 107 mm. The length of each 
of the sutures is 32.5 mm. The width of the entoplastron was 49 
mm. The greatest thickness of the two bones on the suture unit¬ 
ing them is 13.3 mm. The thickness on the epi-hyoplastral suture 
is 11 mm. These measurements agree quite well with those made 
on the two shells of P. floridana, except that the thickness on the 
common suture in these does not exceed 11 mm. 
