DERMATEMYDID^E. 



2 8 3 



and another on the hinder end of the carapace. There are slight traces of a lateral carina on 

 each side, along the outer borders of the vertebral scutes. In outline the carapace is slightly 

 excavated in front and notcht behind. The borders behind the inguinal notches were very 



slightly flared upwards. The nuchal bone is well developt, hav- 

 ing a length and breadth each of 38 mm. There are no costiform 

 processes. Of the 6 neurals the anterior 4 are hexagonal, with 

 the narrower end directed forward, a somewhat unusual thing 

 among both Cryptodire and Pleurodire turtles; nevertheless 

 occurring, according to Dr. Boulenger's figures, in the case of some 

 of the neurals of Staurotypus, Kinosternon, Cyclemys, Geomyda, 

 and Cyclemys. The sixth neural of our species is quadrate, the 

 seventh is triangular. The table gives the dimensions of the 

 neurals. 



Behind the costals of the seventh pair there is a single suprapygal, 22 mm. long and 38 mm. 

 wide. This is succeeded by the notcht pygal, which has a length of 23 mm. and a width of 

 28 mm. 



355- 



FIGS. 355 AND 356. Xenochelys formosa. Carapace and plastron of type. Xj. 



355. Carapace. 



356. Plastron, an, anal scute; ent, entoplastron; tpi, epiplastron; ftm, femoral scute; 



g, supposed gular scute; hum, supposed humeral scute. 



As already stated, there are only 7 pairs of costal plates, of which the two hindermost 

 pairs reach the midline of the shell. The anterior pair is well developt, having an antero- 

 posterior width of 35 mm. The costals are about 3 mm. in thickness. 



The peripheral bones are relatively large, and there are only 10 of them on each side. The 

 second measures 26 mm. from the free border to the union with the costal plate; the third, 

 35 mm. The free borders of the anterior and posterior peripherals are acute. They attain 

 a maximum thickness of about 9 mm. The sulci bounding the epidermal scutes are moderately 

 imprest. There is a very small nuchal scute. The vertebral scutes have a width each of about 



