188 THE Ottawa NATURALIST. [January 
‘ 
thus forming a stout ridge for the reception of the inguinal butt- 
ress. ; 
The specimen shewn in figure 2 is apparently the proximal 
end of the left 6th costal plate. This costal when complete was 
evidently much broader toward its outer end. Deep sulci on the 
upper surface mark the position of the 4th vertebral and the 3rd 
and 4th costal shields. Distinct grooves also cross this plate from 
side to side at its inner end where the sutural surfaces for articu- 
lation with the 6th and 7th neural plates are preserved. 
The third specimen (figure 3) is the inner end of the left 1st 
costal and on its surface are concentric grooves indicating an 
epidermal shield pattern such as is found in some of the modern 
species of the genus. 
These specimens shew that the costal plates were alternately 
narrow and broad distally, and broad and narrow proximally, a 
common character of species of Testudo. 
The writer is indebted to Dr. O. P. Hay, of the Aineerene 
Museum of Natural History, New York, for critical suggestions 
relative to the specimens on which the present species is based. 
Measurements. 
rst costal plate. MM. 
Maximum thickness at centre of proximal end...... 7s 
Thickness of specimen at anterior suture ......... B= 
- ae. yo MPOSteHION. 2, Prarie tk Sa 
5th costal plate. 
Thickness at proximal end of specimen .... ....... 5 
a near distal end at anterior suture.... ... 5 
BF distally. near posterion suture... .-. ae eee 8 
6th costal plate. 
Thickness at proximalend ©2323 i ee 8 
This species is peculiar on account of the extreme narrowness 
and thickness of the 5th costal plate. The surface of the carapace 
bore a distinct pattern of grooves which were anteriorly at least 
arranged concentrically within the boundaries of the epidermal 
shields. 
: 
i 
4 
a 
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a 
3 
