TAB. XIXZ>. 



Fig. 



1. Under view of the lower jaw of a turtle (Chelone), nat. size. (Hordwell Cliff). 



2. Upper view of the same specimen. 



3. Upper view of the fourth cervical vertebra of a Trionyx ; d, diapophysis. Nat. 



size. 



4. Side view of the same specimen (Hordwell Cliff). 



5. The left os pubis of a Trionyx, nat. size (Hordwell Cliff). 



6. Part of the plastron of Trionyx planus, half the nat. size ; lis, hyosternal ; 



ps, hyposternal. 



7. Right hyposternal of a Trionyx, from Bracklesham, half the nat. size. (In the 



Collection of Frederick Dixon, Esq., F.G.S.) 



