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



The shoulder girdle is practically complete. The scapula is 

 a flattened bone about 145 mm long and, near the glenoid end, 

 is about twice as broad as it is thick. It makes an angle of 

 120° with the procoracoid process, which is 95 min long. The 

 coracoid is a broad triangular bone, measuring 85 mm along the 

 medial side, 75 mm along its front border and 105 mm along the 

 posterior border. The humerus is a heavy bone, 173 mm long, 

 with a head 45 mm in diameter. However, for the size of the 



Fig. 3. 



Fig. 4. 



Fig. 3. 

 Fig. 4. 



Humerus of T. arenivaga from the radial size. 

 Femur of T. arenivaga. % nat. side. 



3^ nat. size. 



skull, this, as is also the case with the other limb bones, is 

 relatively light when compared with that of T. orthopygia, 

 T. osborniana, or T. pensa. The lesser tubercle is swung 

 well to the rear ; so the intertubercular sulcus between it and 

 the wing-like greater tubercle is unusually narrow and deep. 



The pelvis is also relatively light and offers no particular 

 features. The femur is relatively small, being 142 mm long, 

 the shaft being much flattened toward the distal end. At the 

 condyles it is 56 mm wide. A few phalanges are present, the 



