24 F. B. Loomis — Turtles from the Upper Harrison Beds. 



The plastron is 429 mm long and 220 mm wide, the anterior lip 

 projecting far in front of the carapace. The front of the plas- 

 tron is turned upward, the lip projecting straightforward from 

 it. The rounded anterior end of the lip is deeply notched, and 

 from the front it thickens until about 70 mm back the lip is 

 about 30 mm thick. Just behind this point it drops down, mak- 

 ing a considerable wall. The endoplastron is T0 mm long and 



Fig. 7. 



Fig. 8. 



Fig. 

 Fig. 



Humerus of T. brevisterna from the radial side. 

 Femur of T. brevisterna. % nat. size. 



3^ nat. size. 



86 mm wide. The relationships of the different elements are 

 shown in the scale drawing, fig. 6. 



The scapula is a flattened bone (92 m,n long) making an angle 

 of 119° with the procoracoid (62 mm long). The humerus is 

 greatly flattened and very broad, the lesser and greater tuber- 

 cules being wide spread, and having a broad intertubercular 

 sulcus between them. The head of the humerus, however, is 

 relatively small (see fig. 7), but the distal end of the bone 

 is again wide and flat. 



The pelvis has a short stout ilium, and the whole build of 

 pubis and ischium is heavy, especially the short prepubic process. 

 The femur, unlike the humerus, is a short, stout bone, 82 mm 

 long and widely oval in section. Both the tibia (65 mm long) 

 and the fibula (70 mm long) are rod-like with a circular cross 

 section, and taper gradually toward the distal end. The feet 

 are wanting. 



While the cervical and caudal vertebrae are present they 



