34 



CINOSTERNIDJE. 



Ozotheca, Ayassiz, I. c. p. 424 ; Leconie, Proc. Ac. Philad. 1859, 



( iiiostevnuni, Aymsiz, I. c. p. 42G; Leconte, I. c. 

 Tlivrostermmi, Ayassiz, I. c. p. 427 ; Leconte, I. c. 

 I'liitytli vra, Ayassiz, I. c. p. 429. 



Fig. 11. 



Skull of Cinosi&rnum leucostomum. 



Carapace more or less depressed; marginal shields, one azygos 

 nuchal and 11 pairs. Plastron articulating with the marginals by 

 suture, frout and hind lobe movable; gular shield single or absent: 

 pectoral shields not extending on the bridge. Postorbital and 

 temporal arches moderate. Digits webbed; fingers all clawed, 

 outer toe flawless. Tail short. 



America, north ol the Equator. 



