TESTUDINATA. 
65 
pieces fit together. Seven of the pieces are here figured (pi. 2, 
figs. 1-7). 
The epiplastral (pi. 2, fig. 1) has the sculpture better shown 
than that of the specimen in the National Museum, the ridges and 
grooves being sharply defined. Here, as in other parts, the ridges 
are more or less interrupted in their course. Those in the gular 
area are directed fore and aft; those of the humeral area are at 
nearly right angles to the midline of the plastron. The same is 
true of the upper side of the bone. At the free border the ridges 
are carried out into sharp tooth-like processes. The width of the 
gular scutes, taken together, was 52 mm. The width of the bone, 
from the median border to the outer angle, is 53 mm.; the thick¬ 
ness at the suture for union with its fellow is 11 mm. . 
The fragment of the rig’ht hyoplastron (pi. 2, fig. 2), does 
not reach the midline and falls short of reaching the hypoplastron. 
Furthermore, the free border in front of the axillary notch is dam¬ 
aged. Its sutural borders for union with the epiplastron and the 
entoplastron are present. The epiplastron appears not to have 
made so deep a notch between the hyoplastrals as in Trcichemys 
scripta. The thickness at the hyoepiplastral suture is 11.5 mm. 
The pectoral scute had a width of 33 mm. near its outer end. The 
character of the very distinct sculpture is shown by the figure. 
The portion of hypoplastron adds nothing to the knowledge 
beyond that furnished by the nearly complete bone in the National 
Museum; and the sculpture of the latter is better defined. 
The neural bone (pi. 2, fig. 3) is quite certainly the fourth. 
The length on the midline is 26 mm.; the greatest width 36 mm.; 
the thickness, 10 mm. The upper surface is covered with numer¬ 
ous small tubercles and longitudinal wrinkles. 
The fifth costal is represented by only the distal end. On its 
inner surface is a ridge against which arose the buttress from the 
hypoplastron. 
The first right peripheral (pi. 2, fig. 4) extends back from the 
acute free border a distance of 40 mm. and 36 mm. along the free 
border. Its thickness is 11 mm. The ridges on the area of the 
first marginal scute run nearly parallel with the furrow between 
this scute and the second. Those ridges on the area of the second 
scute run obliquely to this furrow, forward and outward. A part 
of the first costal scute occupied the inner end of the bone here 
described. 
