52 FOSSIL TURTLES OF NORTH AMERICA 
correct when he states that it did not come in contact in the midline with the ischium. The 
pelvis in the specimen here described has probably suffered some antero-posterior crushing, 
but the pubes and ilia do join. In Baéna, whose pelvis is identical with that of Glyptops, 
there is, at least in aged individuals, a union of these elements in the midline. 
The lateral pubic | processes are quite different from those of Chelydra, being more massive. 
At their extremities, where they come into contact with the xiphiplastra, they are enlarged and 
rough. Above this they are constricted into a sort of neck. The ischium is narrow from front 
to Feels about 12 mm., and thin, as in Baéna. Its hinder lower border is nearly straight until 
the processes are reacht on which the ischium rests on the plastron. These processes stand 
at a distance of 30 mm. apart. Each is terete, pointed at its free end, and about 15 mm. long. 
They are directed backward. 
The ilium is not greatly different from that of Chelydra, except that it is shorter and 
proportionately stouter. The sacrum is in general smaller and weaker than that of Chelydra, 
except that the distance of the acetabula apart is the same. The pelvis is essentially like that 
of Baéna and all parts should be compared with those of the latter genus. 
The only portion of the hind limb present is the right femur and probably some foot bones. 
Dr. Baur states that the femur agrees with that of the Emydidz. In length, it is exactly that 
of the Trachemys mentioned and relativ ely much shorter than that of Chelydra. It is much 
curved, especially toward the distal end (figs. 25, 26). The greater trochanter is separated 
from the lesser by a deep fossa. From che? greater trochanter a prominent crest runs down 
on the hinder side of the femur one-third or more of its length. The distal end of the femur is 
damaged, but it presents indications of having had the condyles more prominently developt 
than in turtles in general. The total length of the femur in a straight line is 61 mm. 
One complete toe, which probably belonged to a hind foot, is preserved with the parts in 
place (fg. 27). It shows a metatarsal and three phalanges, and these have a total length of 42 
mm. The metatarsal is slender and has a length of 22 mm. 
> ‘ oe f ae 
~~ iy Ne s _ 
G4 ASS 
ert wae 
ee —~J 
= 
in ae eee) 
ig eae Oy ee | 
ESA Pita a 31. 
y Ft po < 
SS fii ee 30° 
Figs. 28—- Glyptops celatus. Type specimen in U. S. N. M. 
28. Portions of first and second peripherals and 30. Section across hinder peripheral. 
first costal. 4. 31. Proximal end of costal bone, showing scute 
2g. Section across second peripheral. 3. areas and sculpture. 3. 
’ Glyptops czlatus sp. nov. 
Plate 7, figs. 1, 2; text-figs. 28-31. 
The fragments of tortoise to which this name is given were collected by Mr. J. B. Hatcher, 
in 1887, at Muirkirk, Maryland, in deposits belonging to the Potomac formation of the Lower 
Cretaceous. The fragments consist of portions of "eostals and of peripherals. The most 
important fragment consists of the right first costal, a part of the first and most of the second 
peripherals. ‘There is also a part of a costal situated further back in the carapace. These 
bear the number 1930, and belonged doubtless to one individual. There is present also a 
hinder peripheral and a first right peripheral which have the number 1939. There are also 
two fragments of costals of a young individual, one of which shows the rib-head. The bones 
bearing - the number 1930 are regarded as being the type of this species. All the specimens 
are in the United States Nacional Museum. 
