211 



character of the exterior turfmrr , character common to the drrtnal ossified platr* in thr Rrp- 

 Itltm, especially at the cln*ely-allird Crocodilian ordrr. 



Aftu. Brit. 



1 1 >;)<). The carapace and plastron of a young Tenrapene (Emy* co*ce*trica). 



The costal plate* have begun to be ossified from near the proximal ends of each of thr long 

 and slender rib* of the carapace, and from poioU morr nearly parallel with the median linr 

 than in the young Tortoise : the third and fifth are nevertheless nearer the neural plate* than 

 the first, tecond and fourth. The nuchal plate U disproportionately large. The inner bor- 

 ders of the hyo- and hypo-eternal* send many pointed rayt into the middle nM>nibranoiu 

 space, thus temporarily repeating the permanent character of those bones in the Turtle : and 

 the outer border* of the same bone* are till united by membrane to the marginal plates, all 

 of which are independently derrloped in the substance of the corium. 



Mtu. Brit. 



1100. The carapace and hyoeternais of a young Terrapene (Emy* terratd) ; showing 

 the independent development of the large nuchal and first three marginal plates 

 in the substance of the corium, and the slender rib-like portions of the hyo- 

 stemals which join the second dorsal pleura|K>physcN. Altu. LeveriantiHi. 



2i2 



