NATURAL HISTORY MISCELLANY. 665 
oming, indicates this region to have swarmed with these ani- 
mals during the earlier portion of the Tertiary period. Crocodiles 
and lacertian reptiles were likewise numerous. The many mam- 
malian remains found in association with the reptilian fossils 
mainly belong to tapiroid and carnivorous animals. i 
The Wyoming Tertiary fauna presents a remarkable contras 
with the later faunæ of the Mauvaises Terres of White River, Da- 
kota, and of the Niobrara River, Nebraska. Among the large num- 
ber of fossils from these two localities, rich in evidence of 
mammalian life, there occur the remains of a single species of tur- 
tle in each, and none of crocodiles or other reptiles. 
Dr. Carter’s collection, besides containing remains of Trionyx 
guttatus, Emys Jeanesianus, E. Haydeni and E. Stevensonianus, 
and Bena arenosa, also adds two new turtles to the list. One 
of these is a species of Emys of the largest size, and exceeds 
any now living. The carapace has measured about two feet and a 
half in length, and the sternum about two feet. In honor of its 
discoverer, it may be named Emys Carteri. 
The first and second vertebral plates of this species present an 
unusual, perhaps an anomalous appearance. The first is four 
inches long, and clavate in shape with the narrow part foremost. 
The second is two and one-fourth inches long, and presents the 
usual hexagonal form reversed. The third plate, a little longer, 
is quadrate with convex sides. The first vertebral scute is vase- 
like in outline, five and one-half inches long, two and three-fourths 
inches wide in front, four and three-fourths inches near the middle, 
and three and one-half inches at the back border. The seco 
scute, of the ordinary form, is five inches long, and four inches 
wide. 
The second turtle belongs to the recently characterized genus 
Bena, but is considerably larger than its associated species which 
have been described. The shell in its complete condition, has 
been upwards of a foot and a half in length, and is seven inches 
and a half high. The sternum is flat, and about fifteen inches 
long. Its pedicels ascend at an angle of about 45° and are seven 
inches and a half broad. As in the living Dermatemys, and the 
sea turtles, they are covered with large scutes, four in number, as 
in Bena arenosa. The intermediate vertebral scutes are longer 
than broad — the third being four inches long, and three and one- 
half inches wide. A peculiarity of the species is the undulating 
