220 



CHELYDIDJE. 



the adult, in which tlio first is the broadest and tlic fourth the 

 narrowest ; nuchal rather largo, at least twice as long as broad. 

 Plastron large, dec])l)^ notched posteriorly, slightly concave in the 

 male; width of tlie bridge contained three and a half to four times in 

 the length of the plastron ; axillary and inguinal shields very small 



Fig. 59. 



Skull of Hydraspis hilarii. 



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 

 urnHjual transverse scales ; a prominent series of enlarged tubercular 

 scales along the inner edge of the leg. 



