EXPLANATION OF PLATE XI. 



Testudo Oorsoni : 



Both specimens iieitainetl to the same shell, aurt were originaUy described uuder the name 



of Eiiii/^ Carteri. They were discovered near Fort Bvldger by Dr. Carter, and presented to 



the Academy of Philadelphia. 

 Fig. 1. The greater part of the iilastron, its anterior extremity to the right, one-third the 



natural size. 

 Fig. 2. The anterior intermediate portion of the carapace, its front to the left, one-half the 



natural size. 



