PLATE XV. 



PAGE. 



Fig. 1. ScHizoDUs Medinaensis 299 



la. A view of the left side of an internal cast. 



16. A right side view of the cast of another specimen, differing a little in form. 



Ic. An interior view of an internal cast. 



Fig. 2. Pkothyris Meeki 305 



A right side view of a cast, natural size. 



Paljsoneilo BedfordEnsis 298 



A cast, mainly of the exterior, but having portions of the hinge exposed so as to show the 

 denticles. Natural size. 



Eight side view of another specimen in same condition. 



Entolium Shumardiandm? , 292 



Apparently a left valve, external view. 



Internal view of apparently a right valve of the same species. 



AVICULOPECTEN WiNCHELLI 296 



A cast of the exterior of the left valve of a large specimen 

 A cast of right valve of a smaller individual. 



CaRDIOMORPHA ? SUBGLOBQSA 304 



Eight side view of a somewhat distorted specimen. 

 An anterior view of same. 



AviCULOPECTEN CEENISTEIATUS 295 



Cast of the exterior of a left valve. 

 Cast of a right valve. 



