1872.] 475 [Cope. 
groove in a longitudinal elevation of the bone, much as in the Cretaceous 
genus, Taphrosphys, Cope. The point of attachment of the ischium is 
not observed nor is the posterior lobe of the plastron observed in any of 
the specimens. The external part of the hypoxiphisternal suture extends 
very obliquely backwards. The pubic suture-groove diverges very little 
from a line parallel with the common xiphisternal suture. 
Of limb bones several fragments were found in connection with the J. 
testudinea, but are too large to be referred to that species. One is the 
xtremity of a femur, which had a round shaft and but little curvature. 
The other is a proximal end, with a flat, wide trochanter, separated from 
the head by a deep notch, and with a slender curved shaft. 
The genera of Pleurodira, which simulate land tortoises most, are 
found in Africa. They are Sternotherus and Pelomedusa. They are dif- 
ferent enough from Notomsrpha, the former in its hinged, ten-plated 
plastron, the latter in its intercalated bone of the plastron. The present 
form is, therefore, of interest in various ways. It is the first Pleurodira 
tortoise found west of New Jersey, and is the first of that division known 
to exist in the Tertiary formations of North America. As compared 
with those from the Cretaceous, it is distinct in many respects. 
Specimens of this genus are more abundant than any other fossils in 
the localities in question. In two of the individuals, both xiphisternal 
bones are preserved ; in one, the mesosternal; in two, the episternals, 
ete. Three species appear to be represented by my specimens, which 
vary from the size of the salt-marsh terrapin, Malaclemmys palustris, to 
that of the Mississippi snapper, Macrochelys lacertina. 
NOTOMORPHA TESTUDINEA. Cope. spec. noy. 
Represented by portions of four or more individuals. In one of these 
the anterior lobe of the plastron is in part preserved. The mesosternum 
is a transverse oval, the posterior margin regularly convex, the anterior 
with three equal borders. The median of these is concave. The sutures 
are radiating, and the groove separating the humeral scuta, appears to 
traverse the entire length of the bone. The outer surface is gently con- 
vex. The free margin of the episternal and hyposternal bones is acute, 
and with an internal thickening, as in Cistudo, Testudo, ete., forming a 
ridge, with abrupt inner face. This face extends backwards as a groove, 
to the axillary process of the hyosternal, forming a characteristic mark. 
Although the extremity of the episternal bone is lost, and the mesosternal 
exhibits no trace of the intergular scute, the outer sutures of the gular 
scuta are so far posterior, as to render it highly probable that the inter- 
gular plate existed. At the point where this suture reaches the margin, 
the latter is openly emarginate. The posterior suture of the humeral 
scute crosses the margin half way between the axilla and the episternal 
suture, and is not marked by a notch. The last named suture is trans- 
verse. On the xiphisternal bones the groove of the anterior suture of 
the anals is plainly visible. It is regularly convex forwards and in one 
specimen is double. 
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