340 FOSSIL TURTLES OF NORTH AMERICA. 
considerably deprest, but probably less so than its present height, 40 mm., indicates. We 
can not determine to what extent, if any, the hinder border of the carapace was notcht. ‘The 
hinder peripherals are slightly recurved. Their free margins are acute. No carina is pres- 
ent, but on the nuchal and the first neural there is a perceptible 
elevation. In the region of the hinder neurals there is a decided 
longitudinal depression. The surface is smooth, except that on 
x the outer ends of the costals there are longitudinal ridges and 
sof Gy nad grooves, due to the growth of the epidermal scutes. 
jek od The neural bones are rather narrow in comparison with those 
of C. picta. Most of them are hexagonal, with the broader end 
forward. ‘The dimensions of the neurals are shown in the table 
on page 345. 
The nuchal had a median length of more than 30 mm., a mar- 
| ginal width of about 20 mm., and an extreme width of 35 mm. 
} (. The suprapygal plates are three in number. The first has a length 
— of 5.5 mm. and a width of 10 mm. The second is bifurcate, 
like the same bone in Testudo, the hinder border being deeply 
concave. ‘The median length is 7 mm., the extreme width, 21 mm. 
The third is nearly diamond-shaped, fitting in between the second 
suprapygal and the pygal. It is 8 mm. long and 15 mm. wide. 
ce oil ae 4 The pygal is 22mm. wide, 17mm. long and 4.5 mm. thick. 
aw oe The first peripheral is 20 mm. fore and aft and the same 
PD UAA YL along the free margin. The eleventh is 18 mm. high and 17 mm. 
ate Nea along the free margin. 
— . . 
; : eer The plastron is somewhat damaged. It is 157 mm. long. 
Fic. 449.—Chrysemys timida. . 2 = : = 
= M4 The anterior lobe is 43 mm. long and 72 mm. wide at the base. 
Carapace. X 3. eas icgutcs ; 
The lip is truncated and appears to have been 40 mm. wide. 
The hinder lobe is 55 mm. long and 84 mm. wide at the base. A broad notch occupied the 
hinder end. The inguinal hares is attacht to the fifth costal plate. 
The entoplastron is 25 mm. long and 27 mm. wide. The hypoxiphiplastral suture appears 
to have run nearly straight across the hinder plastral lobe. 
The hyoplastrals occupy about 36 mm. of the midline; the hypoplastrals, about 48 mm.; 
the xiphiplastrals, about 37 mm. 
The vertebral scutes are rather broad and are strongly bracket-shaped laterally. Their 
dimensions are given in tabular form on the preceding page. 
The inferior surface of the plastron is injured so that few of the sulci can be traced. The 
abdomino-femoral passes between the inguinal notches with a slight convexity forward. The 
femoro-anal sulcus is directed outward and backward. The femoral scutes are about 18 mm. 
long on the midline; the anals, about 30 mm. 
Genus DEIROCHELYS Agassiz. 
Differs from Chrysemys in having the heads of the ribs long and thread-like, and the shell 
sculptured. 
Type: Detrochelys reticulata (Daudin). 
The following species is referred provisionally to Deirochelys. 
S 
Deirochelys floridana sp. nov. 
Plate 54, figs. 1, 2; text-fig. 450. 
The nuchal bone on which the present species 1s based is a part of the Jarman collection, 
the property of the Vanderbilt University, Nashville, Tennessee. The collection was obtained 
in Hillsboro County, Florida, and the deposits probably belong to the Peace Creek beds. 
While the generic position of the species is not assured, the form 6k the bone and especially 1 its 
sculpture so much resemble that of Dezrochelys reticulata that it is referred to the latter inter- 
esting genus. 
