PLATE III. 



Ophileta compacta (page 16). 



Figure 1. Ophileta compacta. Internal sandstone cast ; only a portion of one 

 whorl is left. Internal cast, sandstone, reversed, and shewing the 

 flat or umbilical surface, c, the inner basal angle ; b, the outer 

 basal angle ; a, the upper angle or keel. The convex dome-like 

 cast of the deep cup-shaped spire shews distinctly, as the whorls 

 are broken away. 



" 2. Cast of lower or umbilical surface. 



" 3. Exterior of upper or concave side, a, the outer angle or keel ; 

 d, the inner upper angle. A gutta-percha mould, taken from a 

 cast of the upper surface, representing therefore the true shell. 



