82 FOSSIL TURTLES OF NORTH AMERICA. 
This species differs from B. arenosa in the form of the anterior vertebral scute and in 
having no accessory lateral scute. In these respects it agrees with B. clara. From the latter it 
differs in having the shell broader behind, a wider and more deeply scallopt postero- -lateral 
border, higher lateral marginal scutes, a different arrangement of the most anterior marginal 
scutes, and narrower plastral lobes. The bridge of the plastron is also wider. It measures 
160 mm., while that of the type of B. clara is only 150mm. The bridge of B. arenosa, No. 1115, 
a larger shell, also measures only 150 mm. On the under side of the postero-lateral border of 
the shell. at the fifth scallop, the distance from the line where the soft skin of the animal began 
to the outer edge of the shell is 40 mm.; in B. clara this space is only 33 mm. 
There is in the American Museum’s collection a second specimen of this species from the 
same level. It is somewhat smaller, with a total length of 323 mm., and is less perfect than the 
one which has furnisht the above description. Nevertheless, the principal characters distin- 
euishing the species from the others are exhibited. Altho smaller, the sutures have almost 
wholly disappeared, so that it furnishes no aid in tracing these. 
In the collection of Princeton University there is a somewhat damaged shell which is 
referred to this species. The catalog number is 11263. It was collected by Mr. J. B. Hatcher, 
in 1895, in the Uinta Eocene, at Kennedy's Hole, Utah. The beds contained remains of 
Dolichorhinus cornutus. 
Genus EUBAENA nov. 
Skull resembling that of Baéna, but with the temporal region less extensively rooft over, 
the squamosals not coming into contact with the parietals. Jugals excluded from the rims of 
the orbits. “Triturating ice: of the maxilla transversely broad and concave. Choane 
opening between the orbits: and at nearly one-third the distance from the snout to the occipital 
condyle. Shell unknown. 
Type : Eubaéna cephalica Hay. 
Eubaéna cephalica Hay. 
Plate 19, fig. 4; plate 21, figs. 1, 2. 
Baéna cephalica, Hay, Amer. Jour. Sci. (4), XvI, 1904, p. 262, plate xu, figs. 1-3. 
The name Eubaéna cephalica is given to a fine skull which is in Yale University Museum. 
This skull, which lacks only the lower jaw, was collected in the Laramie deposits of Converse 
County, Wyoming, by Professor ]. B. Hatcher, then employed by Professor O. C. Marsh. The 
specimen bears Bastescon Marsh’s receipt number 2110. 
In general form the skull is broad behind, rather flat above, and with pointed snout. The 
length from the snout to the occipital condyle is 67 mm.; to the end of the supraoccipital 
spine, 74mm. The greatest breadth, just in front of the tympanic chamber, is 65 mm. From 
these chambers the width diminishes to the snout. The flat upper surface of the skull descends 
each way to the perpendicular sides. The sides of the face about the orbits look upward and 
outward, as well as forward. The tympanic opening is nearly circular, 19 mm. 1n its perpen- 
dicular, 15 mm. in its horizontal axis. The orbit is circular and small, its diameter being 14mm. 
The interorbital space is 25 mm. wide. The nasal opening, as seen from in front, 1s somewhat 
heart-shaped, and is directed above and forward. From the orbit to the tympanic opening is 
24mm.; from the nares to the orbit is 10 mm. 
The temporal region is rooft over, but not so extensively as in species of Baéna from the 
Bridger beds. On each side of the supraoccipital this roof is excavated as far as a line joining 
the anterior borders of the tympanic chambers. From the orbit to the bottom of the excava- 
tion is 22mm. The hinder end of the postfrontal is interposed between the parietal and the 
squamosal. 
In general, the sutures of the skull are very distinct, but no trace has been found of those 
between the frontals and the parietals. There are distinct nasals, and these and the prefrontals 
resemble closely the same bones in the Bridger species of Baénide. The prefrontal of each 
side joins the postfrontal, so that the area of fie frontal is excluded from the border of the orbit. 
The sagittal suture extends from the prefrontals to the supraoccipital spine, a distance of 
