144 



The fifth is as wide as it is long, and the remaining plates are considerably 

 wider than long. 



The costal plates have about the same form as in recent species of the 

 genus, but the first one is of greater proportionate breadth. Besides the 

 nuchal plate, it articulates with four marginal plates. The remaining costal 

 plates are of nearly uniform width as in recent emydes. 



The second costal plate articulates with the fourth and fifth marginals; 

 the third, with the fifth and the anterior angle of the sixth marginals ; the 

 fourth, with the sixth marginal alone; the fifth, with the sixth and sevenlh 

 marginals ; the sixth, with the seventh and eighth marginals ; the seventh, with 

 the eighth to the tenth marginals inclusive, and the eighth with nearly the 

 whole of the tenth and the angle of the eleventh marginals. 



The marginal plates have nearly the same form and proportions as in recent 

 emydes. 



The nuchal plate also has nearly the form and proportions as in the latter. 

 The pygal plate, likewise, has the same form, but is proportionately smaller. 



The vertebral scute-tracts have nearly the same form as in living species of 

 Emys, but the intervening ones are longer than wide. They are proportion- 

 ately somewhat narrower than in the specimen first referred to E. Steven- 

 sonianus. 



The first vertebral scute at its fore part extends outwardly nearly to the 

 line between the first and second marginal scutes, and in this position is 

 widest. 



The last vertebral scute, at its posterior border, crosses the last vertebral 

 plate a short distance back of the middle. In recent species of Emys it 

 impresses the pygal plate. 



The costal scutes resemble those of ordinary emydes, and as in these 

 impress the marginal plates at their conjunction with the corresponding scutes. 



The nuchal scute is comparatively short and wide. The specimen being 

 imperfect at the back part prevents us from ascertaining positively whether 

 there existed a pair of pygal scutes as in living emydes, but an apparent curve 

 upon the bone renders it probable that two also belong to the extinct species. 



The marginal scutes resemble those of recent emydes, but the anterior are 

 wider than high, and the posterior, including the pygal scutes, are higher 

 than wide. 



The fore part of the plastron has a half-oval outline slightly projecting, and 



