5 S 
STRANGE DWELLINGS. 
Our next example of the burrowing molluscs is the well- 
known Pholas, popularly called the Piddock ( Pholas dactylus ), 
the shells of which are extremely plentiful upon our coasts, 
PHOLAS IN WOOD. RAZOR SHELL. HOLES OF PHOLAS 
LITHODOMUS. IN ROCK. 
whether empty and thrown upon the beach, or still adhering to 
the living animal and deeply sunken in the rock. Almost in 
every part of our shores the Piddock is to be found wherever 
