440 



OLIVER P. HAY 



other structural peculiarities indicate that the ancestors of this 

 turtle early parted company with the rest of the order. 



7. The order of Testudinata is composed of two suborders, 

 Athecae and Thecophora. 



Doctor Versluj^s has presented a figure which was designed to 

 show his conception of the composition of the carapace of the 



Text Figure 



primitive testudinate. The present writer has taken the liberty 

 to modify the figure so that it shall present in a way his own 

 views regarding the structure of the carapace of this interesting 

 and theoretical animal. In addition to the epithecal bones shown 

 on the carapace, the tail, and the neck, the writer has indicated 

 a number on the head which underlay its horny plates. It 

 appears evident that Jaekel's Triassochelys possessed a num- 



