MOLLUSCA. 
445 
stance, and is much employed in the manufacture of 
tooth-powder ; and by silversmiths for moulds, to cast 
their small work, such as spoons, rings, &c. It is also 
converted into that useful article of stationery, called 
pounce. This plate, on account of its lightness, is some- 
times called sea-foam, or sea-biscuit. 
The animal of the Argonaut, or Paper Nautilus, is a 
kind of Sepia. 
