WOOD-BORIXG BIVALVES 



1 Watering-pot Shell, Aspergilluni vagini'lerum. 3 



2 Fragment of wood bored by Ship-worm, Teredo mivalis. 4 



Wofxl-euting Piddock. Xylophaga dorsalis. 



Same, showing depth of burrows, and position, across the grain. 



