BAENIDZ. gI 
(fig. 87) has its upper half very little concave, while the lower half is slightly convex and uneven. 
The anterior articular surface of the first caudal is decidedly concave, but not so much so as is 
the hinder end. 
On the upper surface of each xiphiplastron is a depression about 30 mm. long and half as 
wide. The inner borders of the two are 55 mm. apart. The tuberosities of the ischia appear 
not to have fitted into these depressions, for they are less than 55 mm. apart. From each of the 
ve 
— 
‘Gs. 83-87.—Chisternon hebratcum. No. 
5904 A. M. N. H. 
83. Side view of all the cervical vertebra. The front 
ends toward the left. 3. 
84. Scapula. 4. 
85. Pelvis, from right side. xh. 
86. Pelvis, from below. 4. 
87. Sacral vertebra and ribs. %. 
tuberosities there projects backward a long pointed process that must have extended somewhat 
behind the hinder border of the plastron. The lateral processes of the pubes rested on the 
hypoplastra at points about 25 mm. inside the free borders of the hinder lobe. 
Genus BOREMYS Lambe. 
Boremys, LamBr, Ottawa Naturalist, x1x, 1906, p. 232. 
Like Baéna, but having on each side supramarginal scutes, which alternate with the 
costal scutes. Nuchal bone short and wide. A preneural present. 
Type: Boremys pulchra Lambe. 
