4 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
near Tarbert; at the mouth of Loch Striven, opposite 
Rothesay ; Loch Long, off Ardarroch; Balloch Bay, Cum- 
brae ; and in the Holy Loch. 
The variety hippopus is sometimes met with in Rothesay 
Bay, and deformis is not uncommon on the shore at low 
tide in various localities, of which Lamlash Bay and Camp- 
beltown Loch may be specified; at both of these parasitica also 
occurs. Attempts at oyster culture have been made at the 
Holy Loch and Lochgoilhead, but have not been attended 
with success, although in the Holy Loch adventure consider- 
able pains were taken to ensure it. 
It is, of course, not easy to assign a reason for the frequent 
failure of oyster culture with us; but in the two cases named 
above it is probable that there is too great a deposit of sand 
and mud going on. A better locality would probably be 
found on either side of Campbeltown Loch; there are here 
already some small natural patches of oysters, the deposit of 
sand or mud is almost nz/, and there is but slight disturbance 
from navigation. 
British distribution —Gregarious throughout our seas. 
The most extensive natural Scotch beds are at Loch Ryan 
and the Firth of Forth. 
Foreign localities—Iceland (Mohr), Norway (Lovén, and 
others), north and south of Spain and Portugal (‘A ndrew), 
Mediterranean (Jeffreys), Mogador (M‘Andrew) doubtfully. 
FamILy PectTinipé, Lamarck. 
Prcren, Bruguiere. 
* Pecten pusio, Linné. 
Ostrea pusio, Linné; Pecten minimus, etc., Lister; Pecten 
distortus, Da Costa; Ostrea sinuosa, Maton and Rackett ; 
Hinnites sinuosus, Deshayes. 
Habitat—On hard ground in 8 to 25 fathoms, attached 
to stones and valves of bivalve shells; scarce. I have 
taken it in Rothesay Bay off Bogany House, and at 
Cumbrae outside the Tan Spit. Mr. Norman reports it 
from Lamlash. 
British distribution —Throughout all our seas; apparently 
common in Shetland, and on the east coasts of Scotland and 
northern England. 
Foreign localities—Norway (Lovén), Spain and Portugal 
(M‘Andrew), Mediterranean (Forbes, and others), Canary 
Islands and Madeira (M‘Andvew). 
