70 THE INVERTEBRATE FAUNA 
The oyster occurs chiefly in the Firth in a 
few fathoms of water (5 to 10) on the 
bank stretching west from Inchkeith, and 
is dredged for the market by the fishermen 
from Newhaven, etc. We regret to say 
it is by no means plentiful. 
The forms (they are scarcely varieties) 
hippopus and deformis occur (JL). 
PECTINID. 
Pecten pusio (Linn.). 
Firth of Forth £B.). 
Taken living in a tangle root, after a storm, 
on Craigroyston shore—attached by a 
byssus. Single valves are not uncommon 
on North Berwick shore, etc. (JZ). 
P. varius (Linn.). 
Firth of Forth U/B.). 
P. opercularis (Linn.). 
This is probably the commonest Lamelli- 
branch in the Firth. It is abundant on 
the so-called “oyster bank” and other 
localities, and is dredged in large quantities 
by the Newhaven fishermen. 
Specimens, with pure white shells, are 
brought in alive by storms somewhat plen- 
tifully at Craigroyston (JZ). 
Gwyn Jeffreys states that specimens of 
this species from the Firth of Forth “are 
much larger than usual,” and that a speci- 
men in his collection from Portobello 
measures 3 %,ths inches long, and nearly 4 
broad. 
The variety lineata, with intermediate 
forms, is often taken by the Newhaven 
fishermen (JZ). 
P. septemradiatus ? (Miill.). 
It is probably this species which is men- 
tioned in Fleming’s “ British Animals” 
