PLATE XX.—( Continued.) 
PAGE. 
RHIPIDOMEDLLA, PREOBLATAQM. Spec raercistelet cee) cio ten edema nena ete 232 
A pedicle valve. Nearpass section, Locality 2 A.® 
The internal cast of a pedicle valve. Same locality. 
PHOLIDOPS JOVATA. | Hvala ier misters sacich ueder etal ete re 226 
. A complete shell, showing external markings. Nearpass 
section, Locality 2A." (x8). 
Internal cast of a similar shell. Same locality. (x3). 
. Internal cast of a smaller individual. Nearpass section, 
Locality 2A*® (x8). 
