532 
MoUusca. 
THE SNIPE SHELL, (Murex haustellus, or cornutus,) 
So called on account of the length, of a prominency 
coming out of the shell. It is surrounded with blunt 
prickles, and the colour of the whole is elegantly varie- 
gated. 
THE PERIWINKLE, (Littornialittorea,) 
Is too well known to require any description. It is 
found in incalculable numbers all round the European 
coasts, and captured in immense quantities as an article 
of food. 
THE LIMPET. (Patella.) 
The shape of this shell is pyramidal ; it adheres to the 
rock with such strength, that it can only be removed 
by means of a knife or a strong blow. The apex of the 
shell is sometimes sharp, sometimes obtuse, and often 
surrounded with points and sharp prickles. When 
thoroughly cleansed the shell is generally of a beautiful 
purple tint of great brilliancy, though the animal that 
