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 (M.). 



PECTINID.E. 



Pecten pusio (Linn.). 



Firth of Forth (MB.). 

 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. (M). 



P. varius (Linn.). 



Firth of Forth (MB). 



P. opercidaris (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 (M). 

 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 T %ths inches long, and nearly 4 

 broad. 



The variety lineata, with intermediate 

 forms, is often taken by the Newhaven 

 fishermen (M). 



P. septemradiatus ? (Mull.). 



It is probably this species which is men- 

 tioned in Fleming's " British Animals " 



