no. 1640. NEW SPECIES OF FOSSIL TURTLES— HAY. 167 



ends of the fifth peripherals measures 110 mm., but was originally 

 possibly not more than 100 mm.; the width at the front ends of the 

 eighth peripherals, 100 mm. The height above the lower surface of 

 the plastron is not more than 55 mm. The region occupied by the 

 vertebral scutes is flat, with perhaps a mere suggestion of a depression 

 near the borders of the scutes mentioned. The second and third 

 peripherals are flared rather strongly upward. Those of the eighth 

 and succeeding pairs are flared only slightly upward. 



The nuchal bone originally measured about 28 nun. fore and aft. 

 The extreme width is 41 mm., the width in front is 17 mm. The 

 following table presents the dimensions of the neurals : 



As one of the anomalies of this cara- 

 pace, we find a small bone that appears to 

 be cut out of the area of the first costal. 

 It borders the nuchal. The costals of 

 the seventh pair meet on the midline. 

 A process of the one of the left side turns 

 backward to the suprapygal, thus pre- 

 venting the lift eighth from meeting its 

 fellow. The suprapygal is 17 mm. high 

 and 25 mm. from side to side. The pygal is 11 mm. high and 13 mm. 

 wide at the upper border. 



The scutes of the carapace are extremely irregular and anomalous. 

 On the left, the intercostal sulci, instead of descending on the second, 

 fourth, sixth, and eighth costal plates, descend on the first, third, fifth, 

 and seventh. Those of the right side are normally placed. As a re- 

 sult of this disturbance, the second, third, and fourth vertebral scutes 

 are directed diagonally from the right to the left and forward. They 

 are then each divided by a sulcus running diagonally to the left and 

 backward. The first and the fifth are unsymmetrical. 



Of the plastron (Plate XXVI, fig. 2) there is missing the right epi- 

 plastron and a little of the left. The total length was close to 134 mm. 

 Of this, the anterior lobe occupied about 50 mm. The width at the 

 transverse hinge is 83 mm. The entoplastron is 31 mm. long, with 

 equal width. The width of the hinder lobe, at the lateral hinge-lines, 

 is ill mm.: at the hypo-xiphiplastral suture, 84 mm. The rear is 

 nearly truncate in outline. The lateral hinge-lines are about 25 mm. 

 long. 



The gulo-humeral sulci extend well backward on the entoplastron. 

 The humero-pectoral sulcus crosses the entoplastron a little behind 

 the middle of its length. The pectoral and the abdominal scutes each 

 measures 22 mm. on the midline; the abdominals, 21 mm.; the anals, 

 42 mm. 



The skull (Plate XXVI, fig. 3) resembles in general that of T. 

 Carolina and T. ornata. The quadrato-jugal bones were wholly unde- 



