420 FOSSIL TURTLES OF NORTH AMERICA. 
line was truncated in front, broadly rounded behind. On the area of the first vertebral scute 
is a prominent median ridge forming an elongated boss. 
The nuchal bone is 73 mm. long, 63 mm. wide in front, 98 mm. where widest. The first 
neural is 4-sided; all the others are hexagonal, thus resembling those of 7. imusitata. The 
accompanying table gives the dimensions of these neurals, of some of the costals, and of the 
vertebral scutes. 
Dimensions of neurals. Dimensions of costal bones. | Dimensions of vertebral scutes. 
. : = Width at Width at P Greatest 
No. Length. Width. No. macalendt een eas No. Length. ath 
I 48 32 2 33 ; I 77 gt 
2 30 40 3 33 33 2 64 80 
a 32 49 4 29 28 3 60 80 
4 28 47 5 29 38 + 57 7 
5 32 42 6 25 32 5 5st 110+ 
6 23 43 
7 23 35 
8 15 27 
‘The costal plates are only slightly differentiated as regards the width of the upper and 
lower ends. 
The sulci are narrow and deeply imprest. The vertebral scutes are wider than long and 
their sides are not greatly angulated. 
The scutal areas of the carapace are more or less strongly grooved by the lines of growth 
of the scutes. The plastron (plate 70, fig. 2) has a total length of 290 mm., or 273 mm. along 
the midline, the notch in the rear being 17 mm. deep. The length of the anterior lobe is 95 
mm.; its width at the base, 148 mm. From the axillary notches it contracts gradually to the 
gulo-humeral sulci. The lip is 33 mm. long, 60 mm. wide, with nearly parallel sides. Its 
anterior border is notcht at the midline and: slightly tootht laterally. On the upper surface 
the thickening of the lip extends backward 44 mm. ‘and the thickness becomes 25 mm. The 
entoplastron is 51 mm. long and 56 mm. wide. The bridge is 120 mm. long. The hinder lobe 
is 140 mm. wide at the base and 75 mm. long to the extremities of the xiphiplastra. 
The gular scutes are 40 mm. long on the aalines they lack 16 mm. of reaching backward 
to the entoplastron. The humerals occupy 73 mm. of the midline; the pectorals, 17 mm.; 
the abdominals, 83 mm.; the femorals, 34 mm.; the anals, 22 mm. 
This species neces closely 7. imusitata of the Deep River beds of Montana. It differs 
from that geologically later species in having a longer plastral lip and especially in the failure 
of the gular scutes to reach the entoplastron. The femoral scutes are relatively wider than 
those of the Montana species. The type of the latter has but seven neurals; the present 
species has eight. In 7. inusitata the widths of the upper and lower ends of the costal plates 
differ more ian in the species here described. 
This species is dedicated to my wife, Mary Emily Hay. 
Testudo pansa sp. nov. 
Plate 71, figs. 1, 2; text-figs. 550, 551. 
This very distinct and striking species was discovered by Mr. Barnum Brown, of the 
American Museum of Natural History, in the Pawnee Creek beds of the Miocene of Colorado: 
in 1901. The exact locality where the type and only specimen was found is near the line 
between the states of Colorado and Nebraska, north of Sterling, Colorado. The number of 
the specimen is 5869. 
The form of the species is rather peculiar in the genus. It is broad, deprest, somewhat 
rounded in front, and broadly rounded behind. The plastron is extremely flat. The upper 
surface of the shell passes abruptly into the lower surface, the free border of the carapace in 
front passing into a lateral carina on each side, and this again into the free border behind. 
The total length of the carapace (plate 71, fig. 1; text-fig. 550) is 775 mm. The greatest 
width is 690 mm. The elevation of the carapace above the plastron is now only 250 mm., and 
