PIIASIANELLA 



Some fossil species are found in the neighbourhood of 

 Paris, and in the London Clay, they are all small ; the 

 principal one. Ph. JPrinceps, is spirally grooved on the 

 outside, and the others have generally some remaining 

 colour in spots as in the recent shells : their fossilized 

 opercuia are found with them. 



Fig. 1 Ph. varia. — Lam. 



2 Operculum of the same, 



3 Ph. Princeps. 



4 Ph. Pullus. 



