BAENIDZ. 99 
have been expected. There is present a portion of one plastral buttress, the length of which is 
72 mm.; but this has the appearance of being the inguinal buttress. 
The second costal (fig. 93) has a length of 142 mm., a width of 54 mm. at the costo-vertebral 
sulcus, and of 60 mm. at the distal end. The proximal end is crost by the sulcus bounding 
laterally the second vertebral. This had a width of about 110 mm. Anteriorly it narrowed 
considerably. Its anterior end occupied only 18 mm. on the first costal plate. The distal end 
of the costal is crost by the costo-marginal sulci, a condition showing that the fourth and fifth 
marginal scutes overlapt on the costal bone. 
The third costal plate (fg. 93) is slightly narrower than the second at the proximal end and 
wider than the latter at the distal end. The fifth and sixth marginal scutes overlapt slightly 
on the distal end. The proximal end was occupied by a part of the second and a small part of 
the third vertebral scutes. The fourth left costal (fig. 94) is 48 mm. wide at the costo-vertebral 
sulcus; 66 mm. at the distal end. That portion of the third vertebral scute on the proximal 
end of this costal is 48 mm. wide. The costo-marginal sulcus skirts along the distal end of the 
Fics. 93-95.—Charitemys captans. Costal bones and plastron of type. 4. 
g3- Second and third right costals, the second on the right. 94. Fourth to seventh costals of left side. 
95. Plastron considerably restored. 
bone. The fourth and fifth costals are each 45 mm. wide. Of the seventh there is present a 
fragment 46 mm. long and 31 mm. wide at the sulcus. The rib-heads of the fifth and sixth 
costals have a diameter of about 6 mm. No trace of the articulation for the inguinal buttress 
appears on the parts preserved of the fifth and sixth costals. It is evident, therefore, that this 
buttress did not ascend to as high a point as did the axillary. From the form of the sutural 
border of the supposed inguinal buttress it is believed that the latter was articulated to the 
fifth and sixth at their junction. 
Of the plastron (fig. g5) there are present a fragment of the left epiplastron, a large part 
of the right hyoplastron, the left hypoplastron, and a portion of the free border of the right 
xiphiplastron. These are represented in the diagrammatic figure. 
That this turtle possest a mesoplastron is evident; otherwise, the bridges would have been 
only about 100 mm. wide, about one-half as wide as the costals spanned by the two buttresses 
of one side. No part of the mesoplastrals appears to be included among the bones present. 
Their antero-posterior width ts only conjectural, 
