EMYS. 107 
The right hyposternal plate, along the median suture, is two inches and a half; 
where widest, it measures in the same direction three inches and a quarter; where 
thickest, just back of the middle of the median suture, it is three-fourths of an 
inch; and where thinnest, externally, it is half an inch. 
Emys beatus. 
The museum of the Academy of Natural Sciences of Philadelphia contains 
several plates and fragments of others of a carapace of a Turtle, from the Green 
sand of Mullica Hill, Gloucester County, New Jersey, presented by William M. 
Gabb. The specimens, represented in Figs. 1-3, Plate X VIII, consist of part of 
the first vertebral plate, the entire third and fourth vertebral plates, portions of the 
first left and second and third right costal plates, and the greater part of the first left 
marginal plate. 
The fragment of the first vertebral plate (a) is the anterior half, and is crossed 
near the broken edge by a groove, indicating the conjunction of the first and second 
vertebral scutes. The lateral borders are sub-angularly convex ; the anterior border 
is irregularly angular. The broken edge is three lines and a half thick, from which 
position the plate thins away to the anterior border, where it measures one line and 
a half thick. The breadth of the plate about its middle is fifteen lines, the esti- 
mated length about thirty-four lines. The posterior portion of the plate, which is 
lost, judging from the corresponding margins of the first and second costal plates, 
appears to have been prolonged at its angles so as to join the antero-internal angles 
of the second costal plates. 
The space occupied by the second vertebral plate is estimated to have been about 
twenty lines long and fourteen lines broad at its widest part. The lateral borders 
of the plate were subangularly convex; the posterior border convex. 
The third and fourth vertebral plates (6, c), preserved entire, are elongated hexa- 
gonal, or wide coffin-shaped. ‘The anterior border is concave, the posterior is convex. 
Of the lateral borders, which are straight, in the third plate the anterior is scarcely 
one-third the length of the posterior, and in the fourth plate the anterior is little 
greater than one-third the length of the posterior. The third plate is crossed just 
back of the middle by a groove, indicating the conjunction of the second and third 
vertebral scutes. Its length is two inches, its breadth at the widest part in front is 
seventeen lines, and its thickness five lines and a half. The length of the fourth 
plate is twenty-two lines, its breadth at the fore part sixteen lines, and its thickness 
is the same as the former. 
The fragment of the first left costal plate (d) is the vertebral portion, and is 
grooved by the first and second vertebral scutes. It is thickest at the postero- 
internal angle, where it measures four lines and a half and thins away to three lines, 
two inches from the vertebral border. It appears not to have articulated with the 
second vertebral plate, from which it was separated by the prolonged basal angle 
of the preceding vertebral plate.. Internally it presents a robust costal process for 
articulation with the first vertebra of the carapace. 
The fragments of the second and third right costal plates are also vertebral 
