14 EMYDOSAURIAN AND TESTUDINIAN REPTILES 
prominence more accentuated—though not even here rising 
above the level of the vertebrals—and the coarser vertical 
strie much more pronounced; its width 4 of its depth: 
fourth costal pentagonal, owing to the acutely angular point 
which projects backwards and is inserted for some distance 
between the fifth vertebral and third marginofemoral shields ; 
the knob is prominent, but small, and is situated some distance 
below the upper angle ; the striz are moderately developed ; 
its length is 3 of its depth. 
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each with the outer border strongly convex, the posterior 
concave, and the basal width rather less than the length ; 
humeral shield tetragonal, with the outer border feebly, the 
anterior strongly convex, the posterior irregularly concave, 
its greatest width 4 of its length ; from the outer front margin 
of the median vacuity a deep narrow groove extends outwards 
and backwards, and, crossing the humero-pectoral suture, 
is lost near the middle of the outer border of the pectoral | 
shield : pectoral shield subtetragonal, the outer border 
slightly concave, the posterior widely angulated, its greatest 
width near the posterior border equal to its length on the 
median line : abdominal shield hexagonal, the anterior and 
posterior borders concave ; inner borders straight, forming 
together a rectangle, the anterior limb of which is twice as 
long as the posterior : outer borders also meeting at a right 
angle, the anterior limb strongly concave and 1? time the length 
of the posterior, which is sigmoidal : width of bridge 144 in 
length of plastron: anterior inframarginal shield half-moon 
Plastron smooth ; gular shields small and triangular ; 
shaped, its length twice its median width: posterior infra- 
marginal much larger, triagonal, the anterior border convex, 
the posterior concave, its greatest width 4 of its length : 
femoral shield pentagonal, a little wider anteriorly than long : 
anal shield acutely triangular, its width 2 of its length. 
Upper surface of fore limbs anteriorly with several series 
of narrow elongate scale-like plates arranged obliquely ; outer 
edge with three large free foliaceous tubercles, below which 
are a pair of large flat unguiform plates ; lower surface finely 
reticulate, with scattered scale-like tubercles of various sizes ; 
upper surface posteriorly rugose, with small round tubercles ; 
claws very strong and curved, especially the three inner, 
the middle one of which is the longest, as long as the space 
