220 CHELYDID&. 
the adult, in which the first is the broadest and the fourth the 
narrowest ; nuchal rather large, at least twice as long as broad. 
Plastron large, deeply notched posteriorly, slightly concave in the 
male ; width of the bridge contained three and a half to four times in 
the length of the plastron; axillary and inguinal shields very small 
Fig. 59. 
iy ie a; 
\\ ( 
4 
us 
7 
spi 
i 
i} 
th 
A 
Skull of Hydraspis hilarit. 
or absent. Snout rather pointed, with the nasal region very slightly 
produced. Upper surface of neck with small warts. Limbs very 
broadly webbed, fringed on the outer side, covered anteriorly with 
unequal transyerse scales ;_ a prominent series of enlarged tubercular 
scales along the inner edge of the leg. 
