1. DKKMOCnELYS. 



9 



turc as In the Cryptodira ; but in one adult skull the sympliysial 

 suture persists. The hyoid (according to (iervais) lacks the anterior 

 cornua and the posterior are ossified proxinially ; the body is ossified 

 in its posterior half, and a small ossification is present on each side 

 in front of the cerato-hyals, which are large and bony. 



I'iS-1. 



Skull of Bcrmochclys coriacea. 



The pectoral and pelvic girdles agree in all essential characters 

 with the ChelouidEe ; but the limbs, in sj)ite of adaptive similarity, 

 diiFer in important points : — Thus, in addition to the shape of the 



