AND AYES OF NORTH AMERICA. 



139 



vertebral, as in Chelone. This occurs in Osteopygis. The anterior connection between 

 the carapacial disc and margin is more as in Osteopygis. The first marginal has a weak 

 connection with the disc, but is almost free posteriorly ; the edge of the second marginal 

 U broken, but I have doubts whether it was attached as in the known species of Osteo- 

 pygis by the margin; it was supported by a strong rib as in that genus, a point in which 

 both differ from Chelone. 



Fi£. 39. 



Carapace of Pboplbtjea Soi'ita, restored. 



The lemur has the slender shank of Osteopygis ; the humerus is broad and stout. 



I. Margins of posterior marginals regular or convex. 



Upper and lower inner margins, of 8th marginal bone equal, with cylindric fossa, 

 width | the length — that is much longer than in the O. platylomus : vertebral scuta, elon- 

 gate, little dilated at lateral angles ; width 5th marginal bone little over .6 the length. 



S0P1TA. 



