PLATE II 



FIG. I. Block of Ludlow (Aymestry) Limestone composed of Conchidium 

 knighti. Weo Edge, Shropshire. 



FIG. 2. Nodule of Flint from the Upper Chalk, containing, and derived 

 from, Ventriculiles. Peppard, Oxon. 



FIG. 3. Block of Bembridge Limestone (Oligocene), largely composed of 

 Limnaea and Planorbis. Bembridge, Isle of Wight. 





