TESTUDINATA. 
57 
FAMILY EMYDIDAE. 
TERRAPENE FORMOSA, NEW SPECIES. 
Plate 4, fig. 3. 
Type-specimen .—The greater part of the hinder two-thirds of 
a carapace which belong's in the collection of the Geological Survey 
of Florida. Its catalogue number is 2973. 
Type-locality and formation. —Ocala, Florida. Pleistocene. 
Diagnosis .—Shell high and broad, with a dorsal keel, on each 
side of which the areas of the vertebral scutes are deeply im¬ 
pressed. Hinder border of carapace moderately flared outward. 
Shell thin. 
This beautiful species is based on a carapace (pi. 4, fig. 3) 
which dorsallv lacks the anterior portion back to the second ver¬ 
tebral scute, laterally the left costal and peripheral region to the 
ninth marginal scute and the right costal and peripheral region 
nearly to the sixth marginal scute. In the part of the shell pre¬ 
served there are small areas missing. 
All of the bones of the carapace are solidly united, so that the 
forms of the neural, costal and peripheral bones are unknown. The 
bone composing the neurals and costals is thin. At their upper 
ends the costals are about 4 mm. thick ; at their lower ends, only 
about 2 mm. At the rear end of the eighth marginal scute the 
bone is 10 mm. thick. The rear of the carapace descends very 
steeply to the moderately outwardly turned hinder peripherals. 
The width at the rear of the eighth marginal scutes is 112 mm.; 
but it exceeded this somewhat over the bridges. Measured in a 
straight line, the distance from the front of the second vertebral 
scute to the rear of the carapace is 125 mm. I't is estimated that 
the distance from the front of the carapace to the rear was about 
155 mm. If this is correct, the width was .72 of the length. In 
a specimen of T. Carolina the ratio is .86. While the hinder 
peripherals are only moderately flared outward, as seen from be¬ 
hind, it is different when they are viewed from below. They are 
turned backward 1 so that their lower surfaces are horizontal. The 
very considerable thickness of the peripherals makes possible the 
difference noted. At the middle of the ninth marginal scute the 
distance from the acute free border of the peripheral to its inner 
border is 19 mm. 
From the free border of the peripherals behind the lateral 
hinge-line a low but sharp keel runs forward as far as the cara- 
4 
