282 FOSSIL TURTLES OF NORTH AMERICA 
midline for the space of 85 mm. ‘The sulcus between these and the anals is directed outward 
and backward. Where it crosses the edge of the xiphiplastron there 1s a considerable notch. 
The anals have a fore-and-aft extent of about 70 mm. and a breadth of 103 mm. each. 
The sulcus between the plastral and the marginal scutes runs above the lower peripheral 
suture, as it does in Testudo. 
There is a large inguinal scute, but there is no axillary scute, or a very obscure one. 
On the bridge are Shice considerable bosses, separated by the sulci in front of and behind 
the abdominal scute. 
In endeavoring to find characters to distinguish this species from the others that have been 
described we miss first the epiplastral lip. From AH. majusculus, of the Wasatch, it differs in 
having the bridge longer relatively to the hinder lobe. In the Wasatch species the hinder lobe 
forms about 85 per cent. of the length of the bridge; in H. tumrdus, only about 77 per cent. 
The pectoral scute of H. majusculus is broader than that of H. tumidus, and the anal notch 
is deeper. 
From H. corsonz, of the Bridger beds, the Uinta species appears to differ in several respects. 
The peripherals over the bridges : are evidently higher, the height in the former species amount- 
ing to considerably less than one-half of the width of the bridge, while in the Uinta species the 
height i is equal to one-half of the bridge. In H. corson1, from the inguinal buttress a broad 
ridge runs backward to the rear of the hinder lobe at the midline. Mesiad of this, the upper 
side of the plastron 1s concave, especially next to the ridge. Outside of the ridge the surface 1s 
beveled off, near the buttress steeply, but less and less so more posteriorly, until on the pos- 
terior outer angle of the xiphiplastron the slope is very gentle. In H. tumidus this ridge is 
almost wholly Bhediece and the upper surface of the posterior lobe is convex to near the border, 
then pitches off nearly perpendicularly. This condition continues to the notch for the anal 
sulcus. The hinder extremity of the xiphiplastron of H. corson: is thinned off to a sharp edge 
while in H. turmdus it is thick and the free edge is rounded off. 
Hadrianus? schucherti Hay. 
Text-fig. 481. 
4 dite iv, v; Bibliog. and Cat. 
Hadrtanus schuchert, Hay, Proc: U.S: Nat. Mus., XXII, pee p- 2 
at. Mus., XXIII, 1900, p. 328. 
Foss. Vert. N. A., 1903, p. 450.—ScCHUCHERT, Proc. U.S. N 
The present species is assigned provisionally to the genus Hadrranus, altho it belongs 
possibly to Testudo. If really a Testudo, it is one of the oldest, if not the oldest of the genus, 
coming as it does from the Upper Eocene. 
The type and only known specimen belongs to the U. S. National Museum. It was dis- 
covered by Prof. Charles Schuchert, then of the U. S. Geological Survey, in the Zeuglodon 
beds of the Jackson formation, near Cocoa post-office, in Choctaw County, Alabama. In the 
immediate vicinity Professor Schuchert found bones of the mammals Basilosaurus, Dorudon, 
and of the snake Pterosphenus schucherti Lucas. 
The upper portion of the carapace of this specimen had been eroded away down to the 
upper borders of the peripheral bones. We are therefore unable to determine the characters 
of the neural and costal bones. Nor are we able to determine whether the supracaudal scute 
was single or double. 
The total length of the carapace was originally close to 750 mm. Its width is 525mm. As 
will be seen from an inspection of fig. 481, the lateral borders of the shell are nearly straight 
and parallel with each other. In front of the axillary notch the margins round rapidly into the 
anterior border. The shell is quite truncated in front. The hinder border approaches in form 
a segment of a circle. Neither the anterior nor the posterior border is to any degree serrated. 
The peripherals rise on the sides of the shell to a height of 100 mm. The passage of the lower 
surface of the shell to the upper is quite abrupt; but this appears to be due to a considerable 
extent to distortion by pressure. 
The borders of the carapace over the opening for the hinder limbs are flared gently upward; 
over the openings for the forelimbs they are more strongly flared. 
The plastron is concave, a condition that indicates a male individual. It has a length of 
675 mm. The anterior lobe has a length of 202 mm. and a width of 309 mm. The epiplastral 
