DERMATEMYDID&. 283 
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, hay- 
| | ing a length and breadth each of 38 mm. There are no costiform 
| 
N 1. | Length. Width. - ; i 
| Cae ie | oa processes. Of the 6 neurals the anterior 4 are hexagonal, with 
| 
| alt 2) e the narrower end directed forward, a somewhat unusual thing 
: 5 | 5 | among both Cryptodire and Pleurodire turtles; nevertheless 
A 18 6: occurring, according to Dr. Boulenger’s figures, in the case of some 
4 6 | | of the neurals of Staurotypus, Kinosternon, Cyclemys, Geomyda, 
; : ore al 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. 
YS hum g| , 
\ ae 
tf epi 
t 
( ent 
355° 
Fics. 355 AND 356.—Xenochelys formosa. Carapace and plastron of type. 4. 
355. Carapace. 
356. Plastron. an, anal scute; ent, entoplastron; epz, epiplastron; fem, 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 g 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 
