4 20 



FOSSIL TURTLES OF NORTH AMKRR'A. 



line was truncated in front, broadly rounded behind. On the area of the first vertebral scute 

 is a prominent median ridge forming an elongated boss. 



The nuchal bone is 73 mm. long, 63 mm. wide in front, 98 mm. where widest. The first 

 neural is 4-sided; all the others are hexagonal, thus resembling those of T. inusitata. The 

 accompanying table gives the dimensions of these neurals, of some of the costals, and of the 

 vertebral scutes. 



The costal plates are only slightly differentiated as regards the width of the upper and 

 lower ends. 



The sulci are narrow and deeply imprest. The vertebral scutes are wider than long and 

 their sides are not greatly angulated. 



The scutal areas of the carapace are more or less strongly grooved by the lines of growth 

 of the scutes. The plastron (plate 70, fig. 2) has a total length of 290 mm., or 273 mm. along 

 the midline, the notch in the rear being 17 mm. deep. The length of the anterior lobe is 95 

 mm.; its width at the base, 148 mm. From the axillary notches it contracts gradually to the 

 gulo-humeral sulci. The lip is ^^ mm. long, 60 mm. wide, with nearly parallel sides. Its 

 anterior border is notcht at the midline and slightly tootht laterally. On the upper surface 

 the thickening of the lip extends backward 44 mm. and the thickness becomes 25 mm. The 

 entoplastron is 51 mm. long and 56 mm. wide. The bridge is 120 mm. long. The hinder lobe 

 is 140 mm. wide at the base and 75 mm. long to the extremities of the xiphiplastra. 



The gular scutes are 40 mm. long on the midline; they lack 16 mm. of reaching backward 

 to the entoplastron. The humerals occupy "^ mm. of the midline; the pectorals, 17 mm.; 

 the abdominals, 83 mm.; the femorals, 34 mm.; the anals, 22 mm. 



This species resembles closely T . inusitata of the Deep River beds of Montana. It differs 

 from that geologically later species in having a longer plastral lip and especially in the failure 

 of the gular scutes to reach the entoplastron. The femoral scutes are relatively wider than 

 those of the Montana species. The type of the latter has but seven neurals; the present 

 species has eight. In T. inusitata the widths of the upper and lower ends of the costal plates 

 differ more than in the species here described. 



This species is dedicated to my wife, Mary Emily Hay. 



Testudo pansa sp. nov. 

 Plate 7|, figs. I, 2; text-figs. 550, 551. 



This very distinct and striking species was discovered by Mr. Barnum Brown, of the 

 American Museum of Natural History, in the Pawnee Creek beds of the Miocene of Colorado, 

 in igoi. The exact locality where the type and only specimen was found is near the line 

 between the states oi Colorado and Nebraska, north of Sterling, Colorado. The number of 

 the specimen is 5869. 



The form of the species is rather peculiar in the genus. It is broad, deprest, somewhat 

 rounded in front, and broadly rounded behind. The plastron is extremely flat. The upper 

 surface of the shell passes abruptly into the lower surface, the free border of the carapace in 

 front passing into a lateral carina on each side, and this again into the free border behind. 

 The total length of the carapace (plate 71, fig. 1 ; text-fig. 550) is 775 mm. The greatest 

 width is 690 mm. The elevation of the carapace above the plastron is now only 250 mm., and 



