280 Proceedings of the Royal Physical Society. 



under the name of Pecten glaher as being 



rare in the Firth of Forth. 

 Pecten tigrimcs (MiilL). 



Firth of Forth (M'B., and Ed. Mus.). 



Taken alive in Newhaven Harbour. It 



had probably been thrown away by the 



fishermen (M.). 



We have dredged this species in the Firth, 



and have found it cast ashore at EHe. 

 P. tigrinus, var. costata. 



Single valves of this, and also of the species, 



are found on the North Berwick shore 



(M.). 

 P. similis (Laskey). 



Fifeshire (Flem.) ; Firth of Forth {Laskey). 

 P. maximus (Linn.). 



Firth of Forth {M'B.). 



Single valves are cast up at Craigroyston, 



but not plentifully (if.). 



We dredged this species last summer off 



the Isle of May, in 8 fathoms. 



Mytilid^. 



My tikis edulis (Linn.). 



Firth of Forth (M'B., etc.). 

 Extremely common between tide marks 

 and at low water on many parts of the 

 shore. It occurs in profusion on the muddy 

 beach at Wardie and Newhaven, where 

 it is collected by the fishermen. 



M. edidis, var. inciLrvata. 



Abundant on sloping walls between Gran- 

 ton and Leith, wedged in between the 

 stones {M.). 



M. edulis, var. pellucida. 



Granton (if.). 



We have taken this variety at Wardie. 



M. editlis, var. galloprovincialis. 



Cast up on Craigroyston shore (if). 



