REMARKABLE TORTOISE, TESTUDO LQ-VERIUGII. 497 



Where the epidermal shields form sutures with each other, the 

 bone beneath is deeply grooved, sometimes forming perforations, 

 but always markedly transparent (vide Pis. II. & III. and 

 text-fig. 8). 



Beneath the vertebral shields are four large fenestra shaped 

 like butterflies : the first is entire ; second, third, and fourth 



Text-fie-ure 8. 



Bony carapace of an adult, viewed from above (|- nat. size). 



Feuestrse l|||l; deep grooves beneath shield-sutures " ; neural plates 



np. ; costal plates, cp.; marginal plates, mp. ; nuchal, mm. ; pygals, p. 



divided mesially each by a bony bridge formed of rudimentary 

 neural plates ; the first and fourth are small compared with the 

 second and third (vide text-fig. 8). 



Beneath the costal shields there are also large fenestras similar 

 in shape to the shields under which they are situated. That 



