2 
Cope.] 464 [Aug. 15, 
and marginal bones of very small individuals. These bones are, how- 
ever, not only thoroughly ossified, but are very stout, indicating tlie adult 
age of the animal. The deeply impressed scutal sutures and heavy pro- 
portions, as well as the elevated carina of the carapace, indicate affinity 
with Cistudo, or perhaps, Testudo. As another generic character, it may be 
noted that the vertebral bones are subquadrate, and support the neural 
canal without intervening lamina. 
The carina of the carapace is abruptly interrupted occasionally ; some- 
times with, sometimes without, a pair of pits, one on each ade. The 
marginal bones are well recurved, and the scutal sutures are deeply im- 
pressed on them. 
M. 
Length of vertebral bone.......--. Ce dee ere ens ase Het 000 
Width °° o cues write dase Sen ee tao Gs ae. sU0GD 
Length marginal “ a ELM o Se MUSEO TE TURN ee 4 ive se a0 
This is the least of the tortoises of the ‘Bridger Formation. 
PALMOTHECA TERRESTRIS. Cope. 
Represented by three individuals, one of which may be regarded as the 
type. They are all thinner than the P: polycypha, and larger, being 
about equal to the Aromochelys odoratus of our ponds. 
In the type specimen the carina of the vertebral bones is interrupted 
by a deep sutural groove, which is less pit-like than in P. polyeypha. 
The bone itself is broader than long, being, perhaps, from the hinder 
part of the carapace. The clavicular (episternal) bone is preserved. It 
is characterized by the considerable and abrupt projection of that part 
enclosed by the gular scutum, which resembles what is sometimes seen 
in Testudo. The edge of this part is entire and aeute. The posterior 
part of the projection forms a step-like prominence behind, on the supe- 
rior or inner face. The bone is almost as wide as long, and the mesos- 
ternal causes a very slight median truncation, but overlapped much on 
the inner side. The gular dermal suture does not reach it. 
M. 
Length vertebral bone........3.. Sige aie ss pete oes 1 00U 
Width. ee CCG eb iea tua cre cua outs vee ie CULO 
CRON OPIStOrHal s. 4 cs hee seis csi etek eee se. - 302 
Width “¢ (transverse to axis of body)........ LL 
Width of a costal......... Coa) Ta aN ear eees cere. (ULL 
PLHICKMGNS PLORLIIAILY ne sces ce sete esse sc peeus stance, 60UD 
In a second specimen, a strong groove is seen to bound the lip of the 
front lobe of the plastron as in the species of Motomorpha. In it the 
marginal is seen to be stout, a little recurved, and sharp-edged, A ver- 
tebral differs from those described in being longer than wide. 
In a third individual the gular lip is not so prominent as in the type, 
and the mesosternal bone truncates the clavicular extensively giving it 
thus a more elongate form. The gular scuta expands to its front margin. 
The marginal bone is stout and sharp edged, and is not so deeply im- 
pressed by the dermal suture, ax in P. polycypha. 
