150 MEMOIRS OF THE CARNEGIE MUSEUM 



from the dorsal surface to a subacute edge. There is no ridge leading back from 

 the buttresses as in H. tumidus Hay. In front of the notch on the dorsal surface 

 the plastron is transversely shallowly concave. The plastral buttresses are rela- 

 tively heavy. 



The hyoplastrals meet on the midline for a distance of 108 mm.; hypoplastrala 

 for 120 mm.; xiphiplastrals for 107 mm. 



The sulci on the plastron are relatively narrow but well impressed. The 

 gular sulci run forward and outward from the center, but, as they approach the 

 border, suddenly turn outward and then backward continuing in this direction 

 over the border upon the dorsal surface and fading out at the base of the lip. The 

 sulcus limiting the humerals behind runs backward and slightly inward from the 

 border in front of the axillary notch for a short distance, then turns inward and 

 forward to the posterior boundary of the entoplastron, but does not cross it. The 

 pectorals occupy 41 mm. of the midline, and have a least diameter antero-poste- 

 riorly of 29 mm. The abdominals meet on the midline for a distance of 155 mm.; 

 the femorals for 75 mm.; anals for 58 mm. The plastron at the center has a 

 thickness of only 7 mm. 



The peripherals turn abruptly upwards at the sides of the shell. The sulci 

 between the plastron and peripheral bones on the bridge, although broadly inter- 

 digitativc, run quite a straight course antero-posteriorly. The fifth and sixth 

 peripherals have a width of 64 mm. Their length on account of the missing upper 

 extremities cannot be determined. 



The present specimen is assigned provisionally to the genus Hadrianus, 

 though later it may be found, when more perfect specimens are available, that it 

 belongs to Testudo. It is distinguished from the described species of the genus 

 by the narrow and relatively shallow notch on the posterior lobe; the rounded and 

 thickened ends of the xiphiplastrals, and by having the bridge longer relative to 

 the length of the hinder lobe. In Hadrianus majusculus the posterior lobe is 85 

 per cent, of the length of the bridge; in H. tumidus 77 per cent.; in H. corsoni 

 73 per cent. ; and in the present specimen only 66 per cent. 



Genus Testudo Linnaeus. 



16. Testudo uintensis sp. nov. 



Plate XXVII; text-figs. 21 and 22. 



Type: C. M. No. 2331, consisting of a carapace and plastron, the latter almost 

 perfectly preserved, the former lacking the peripherals of the right side, and the 



