G. JR. Wieland — On Marine Turtles. 



109 



rather than a spine ; and use has been made of this fact, 

 although it might have remained in doubt but for the exact 

 testimony of the present "fine specimen. The interior borders 

 of these marginals, however, do not have the strong digitation 

 seen in Archelo/u being only slightly serrated. 



Fig. 4. 



Figure 4. — Protostega Copei. Shoulder girdle with, humeri and the 

 pelvis of the type x 1/7. The only portions restored are the left coracoid 

 and the right ischium. These elements belong to the very same individual 

 as the skuil, carapace and plastron shown in figures 1-3. [It is likely that 

 consonant with the heavy carapace the limbs were shorter than in P. gigas, 

 and that the coracoids did not actually come into contact with the ecto- 

 pubis.] 



Protostega Copei was not so orbicular a form as ArcJielon 

 ischyros, and its plastron was relatively much shorter. As to 

 the elements other than those now described, it appears neces- 

 sary only to state that the accompanying illustrations suffi- 



