106 EMYS 
Ld 
EMMYS. 
Emys firmus. 
Prof. Cook submitted to my inspection a number of fragments of Turtle shells, 
from the Green-sand formation of Tinton Falls, Monmouth County, N. J., among 
which are several marginal plates of a carapace and fragments of sternal plates, 
apparently belonging to the same individual. The osseous plates are as remarkable 
for their thickness as those of Hmys crassus, from the Eocene sand of Hordwell, 
England, described by Prof. Owen.’ 
The specimens, also supposed to indicate a species of Hmys, consist of fragments 
of the third, fifth, sixth, and seventh right marginal plates, a portion of the sixth 
and the nearly entire seventh left marginal plates of the carapace, and portions of 
the right hyposternal and left hyosternal plates of the sternum. 
The exterior surface of the marginal plates is obscurely marked, as if impressed 
by a piece of lace, but on some of the specimens the marking is obliterated. The 
corresponding surface of the sternal plates is evidently smooth. Outlines of scutes 
on the marginal plates are so obscurely indicated as not to be distinctly traceable. 
The fragment of the hyposternal plate is crossed by a furrow defining the boundary 
of the abdominal and femoral scutes, but the hyosternal plate presents only a short 
interrupted furrow, which may be supposed to define the limits of the humeral and 
abdominal scutes. 
The best preserved of the marginal plates, represented in Fig. 2, Plate XTX, the 
sixth and seventh of the left side, have their outer surface ieee convex, and 
sloping at an angle of nearly 45°. Their under part is strongly excavated to sigan 
the upper boundary of the back opening of the shell. The basal margin of the 
sixth plate is obtuse, but it becomes more acute as it extends along the seventh 
plate. The two plates together measure along the curve of the basal margin five 
inches and three-quarters. The width of the sixth plate about its middle is two 
inches and a half; that of the seventh is two inches and three-quarters, and its 
depth is three inches and three-quarters. 
As indicated in Fig. 8, Plate XIX, the left hyosternal (4) articulated by a trun- 
cated angle with the right hyposternal plate (@) across the line of the median suture 
of the sternum, which was quite irregular in its course. The strongly truncated 
posterior angle of the right hyposternal plate would indicate that it also articulated 
with the left xiphisternal plate across the median suture. The anterior sutural 
border of the left hyosternal plate is sufficiently well preserved to indicate that the 
entosternal plate measured two inches in transverse diameter. 
The left hyosternal plate along the line of the median suture measures two inches 
and a half; its width in the same direction at the outer boundary of the entosternal 
suture is three inches; its thickness at the inner angle of the latter suture is over 
an inch; its thickness at the angle of articulation with the hyposternal plate is five- 
eighths of an inch; and where thinnest, postero-externally, the fragment is half 
an inch, 
1 British Fossil Reptiles, p. 76, pl. 38. 
