Jl6 FOSSIL TURTLES OF NORTH AMERICA. 



longinuchus. From the acute edge the bone thickens, at first rapidly, then gradually, to 12 mm., 

 at the middle of the length. The first peripheral has an extent of 82 mm. along the free border, 

 and 80 mm. from this to the hinder border. Its thickness is about that of the nuchal. The 

 second peripheral measures 65 mm. along the free border. The edge is acute. 



None of the hinder peripherals is present, but there are parts of two from the bridge 

 region. One of these is 65 mm. long and presents 2 faces, which meet at a right angle along an 



FIG. iia. Taphrosphys nwlops. Restoration of carapace of type. Xj. No. 1472 A. M. N. H. 

 Known portions represented by stippled areas. 



obtuse lateral carina. Fig. 113 presents sections of the ends of this bone, a showing the ante- 

 rior end, b, the posterior. A sulcus crosses both faces a little nearer the thicker end. The width 

 of one face, probably that parallel with the plastron, is 43 mm. The other peripheral presents 

 2 faces meeting at an acute angle. Fig. 1 14 shows sections of the ends of this bone, c being the 

 anterior end, d, the posterior. The length of the bone is 60 mm. It seems quite certain that 



