3 
| 
| 
| 
a 
PLATE 5. 
The carapace of the Trionyx Barbare, half nat. size. 
ch. 'The nuchal plate. 
pl. 1—s. The costal plates. 
a, Shows the longitudinal contour of the middle of the upper surface, and fig. 2, 
the transverse curvature of the carapace. 
