152 



MEMOIRS OF THE CARNEGIE MUSEUM 



concave, the upper slightly convex in the same direction. The free edge is acute 

 with a faint median projection, the whole forming a convex covering for the tail 

 that apparently projected but little below the level of the carapace. 



Fig. 21. Testudo uintensis. Carapace of the type, C. M. No. 2331. One-fourth natural size, n.p., 

 nuchal plate; nl and n7, first and seventh neurals ; plus., lip of plastron ; sp., suprapygal; sp;2., second suprapygal. 



The costal plates are alternately wide and narrow, reaching as high a degree 

 of differentiation in this respect as any species of the genus. The diameters of 

 their proximal and distal ends are given in the accompanying table. 



The nuchal plate is largely missing, as well as nearly all of the perii^herals of 

 the right side. Those of the left side have suffered some damage, so that their 

 exact dimensions can not always be determined. They are however of moderate 

 length with thin acute edges on front and back, becoming slightly obtuse along 

 the sides. There are eleven peripherals in the complete series. The greatest 

 thickness of the ninth peripheral, the thickest of any of the posterior members, is 

 16 mm. The second, measured at the suture with the first, is 16 mm. thick. 



The plastron has a total length of 332 mm. The width of the anterior lobe 

 at its base is 150 mm. It has a length of 104 mm. The lip does not extend beypnd 

 the border of the carapace, and it projects but little beyond the general contour 

 of the lobe. The lower surface of the lobe is flat, while the upper is bevelled off 

 from back toward the front, forming rather a sharp anterior border. On the upper 



