KE5IARKABLE TORTOISE, TESTUEO LOYEEIDGII. 



508 



XiphiplastroDs {zp.) form slightly oblique sutures with the 

 hypoplastrons ; their Miiterior median corners enter into the 



Text-fiffure 12. 



Bony plastron of an adult, viewed from witlicnt (| nat size). 

 Fenestra || I; deep grooves beneath epidermal sliield-suture iii— •■ vmizii::: * ; 

 epiplastrons, ep. ; entoplastron, enp. ; liyoplastrons, hp. ; hypoplastrons, hyp. ; 

 xiphiplastrons, zp.; marginal plates, mp. 



posterior corner of the central fenestra, which separates them 

 from each other anteriorly ; a broad open cleft posteriorly ; 

 lateral edges bi-lobate. 



* The groove beneath the median longitudinal shield-snturcs is equally deep, but 

 is not marked, as it would obscure the bony ones beneath. 



