CONCHOLOGY. 
leading from the village of Holcombe to Newton; 
and consists chiefly of nondescript species of Patella 
and Tellina: and a little beyond this, on the same 
level, is another distmet accumulation of shells, 
mineralized into a blood-red Chalcedony or Cor- 
nelian, composed mostly of species of the Cardium, 
Mactra, and Arca. 
We now proceed to a classical enumeration of 
such marine shells as, from the observations of later 
Conchologists, have hitherto been found within the 
precincts of our intended researches, The arrange- 
ment is adopted from that which was given by the 
authors of the descriptive catalogue of British shells, 
in the eighth volume of the Linnean Transactions, 
And that it may be rendered more useful to such as 
collect them for the purpose of scientific arrange~ 
ment, a short generic character is given of each 
family, and a reference to the most accurate en- 
graving of each species. whenever they may be 
found in the beautiful works of Da Costa’s British 
Conchology, Pennant’s British Zoology, (the edi- 
tion of 1812,) Montague’s Testacea Britannica, 
and Turton’s Conchological Dictionary and British 
Bivalves, 
A. With more than two valves, 
CHITON. 
Shell boat-shaped, consisting of several valves 
disposed in a transverse manner along the back, 
