274 FOSSIL TURTLES OF NORTH AMERICA. 
The choanz are far forward. The roof of the mouth in front is vaulted, not greatly unlike 
that of a Testudo. The yvomer apparently extended between the palatines to the pterygoids 
or very close to them. The distance across the palatines, at their hinder ends, is 20 mm, 
The distance across the constricted portion of the pterygoids is 13 mm. There are posterior 
palatine foramina. The lower jaw, as shown by the American Museum specimen, had a 
single sharp cutting-edge, which workt against that of the upper jaw. The lower jaw appears 
to have formed a beak in front. The symphysis is short, about 12 mm. in length. The jaw is 
20 mm. high at the coronoid region. 
The right humerus is present in the Yale specimen, and complete except that the radial 
tuberosity is broken off. The length from the proximal surface of the head to the distal end 
is 83 mm. The greatest diameter of the head is 21mm. The ulnar tuberosity is as large as 
that of Chelydra. The angle between the two tuberosities is nearly the same as in Chelydra. 
The ectepicondylar foramen also resembles that of the genus just named. The distal articular 
surface appears to have been bent toward the palmar surface more than in Chelydra. The ulna 
is like that of Chelydra, but is, relatively to the length of the humerus, longer than in the genus 
named. It is likewise thicker from the dorsal to the palmar surface. The length is 55 mm.; 
the least breadth, 8 mm. The distal end is 19 mm. wide. The dorsal surface is strongly 
markt by ridges for the attachment of muscles. About two-thirds of the radius is preserved. 
Some portions of the hinder limbs are preserved, wholly or partly; but they have not been 
completely removed from the matrix. The right astragalo-calcaneum was found in the right 
axillary notch. It resembles that of Chelydra, but has the fibulare co-ossified with it. 
The vertebra are represented by portions of two cervicals, but they furnish us little 
information. One lies against the head of the humerus and presents a cup-shaped articular 
cavity. The centrum is 1g mm. wide, 
and there is a sharp median carina on 
34. its lower surface. One complete toe 
is present (fig. 339). It was found in 
the right axillary notch; but from the 
length of the phalanges and the fact 
that the right astragalo-calcaneum 
was found close to it, it is concluded 
that it is one of the digits of the hin- 
der limb. 
No. 5934 of the American Muse- 
um furnishes some fragments of the 
cervical vertebra. One of these, a 
339- Digit belonging to specimen of fig. 338. Xt. posterior one, shows that on the under 
a eee See ae X#%. No. 5934 A. M.N. H. side of the Eon there was 2 sharp 
; = a and prominent carina. The anterior 
end of the centrum has right and left articular cavities. A posterior caudal has the centrum 
17 mm. long. The total height of the centrum and the arches is 23 mm. The centrum is 
proceelous. The ulna is represented by fig. 340. It resembles that of Chelydra, but it is rela- 
tively broader and the radial border is thicker. Fig. 341 represents an ungual phalanx and 
the one preceding it. A considerable portion of the pelvis is preserved (figs. 342, 343). The 
upper end of the ilium is missing, but it was probably not broadened. On its anterior border, 
half the height above the acetabulum, is a strong process directed outward and forward. The 
pelvis resembles that of Testudo. The ischial symphysis is 13 mm. thick. There is a long 
antero-lateral pubic process. The pubic symphysis was more than 23 mm. long. 
Dr. Leidy’s second specimen, in the U.S. National Museum, furnishes the right scapula. 
This is represented as seen from behind and of two-thirds the natural size by fig. 344. The 
height of the body above the glenoid fossa is 102 mm; the proscapular process is 54 mm. long. 
Professor Cope described from Ham’s Fork, Wyoming, a species which received the name 
Baéna ponderosa. The specimens are now in the U. S. National Museum, at Washington, 
where the writer has twice examined them. Cope states that his figures are three-fifths the 
size of nature; but the measurements show that they are only half that size. Cope’s fig. 5 
represents the first and second right peripherals. The suture between the two is not well 
340. 
Fics. 339-341.—Baptemys wyomtingensis. Limb bones. 
