Pholas. aay Chiton. 
aaa Go oh Wed Ii Db ae 
MULTIVALVES. 
To = Ke KO 
You have frequently observed on the shore of Aber- 
gelli in Denbighshire, a number of loose stones left 
uncovered by the reflux of the tide; but you did not, 
perhaps, imagine that they contained inhabitants, of 
curious forms and instincts ; yet such is actually the 
case. In each of these, a Pholas has excavated his 
c2 
