276 O. P. Hay — Fossil Turtles in the Marsh Collection. 



EXPLANATION OF PLATES. 



Plate XL 

 Baena marshi Hay ; view of the plastron, x -£. 



On the left side of the figure is seen a portion of the matrix which filled 

 the shell and from which the bone has been removed. On the opposite side, 

 posteriorly, is seen some matrix filling the inguinal notch. From photo- 

 graph. 



Plate XII. 

 Baena cephalica Hay. 

 Figure 1. — Skull seen from above, xf. 

 Figure 2. — Skull seen from below, x f . 

 Figure 3. — Skull seen from left side, x f . 



• Plate XIII. 



Baptemys ivyomingensis Leidy. 



Figure 1. — Skull seen from above, xf. 

 Figure 2. — Skull seen from below, x f . 

 Figure 3. — Skull seen from left side. xf. 



Plate XIV. 



Chrysemys wyomingensis (Leidy) ; carapace, showing supernumerary bones 

 and scutes, x f . From photograph. 



Plate XV. 



Hadrianus majusculus Hay ; shell seen from the left side, x £. From 

 photograph. • 



Plate XVI. 



Aspideretes beecheri Hay ; skeleton seen from above, x £. From photo- 

 graph. 



