72 THE INVERTEBRATE FAUNA 



Mytilus modiolus (Linn.). 



Firth of Forth (MR, and Ed. Mus.). 

 Common at North Berwick, living at very 

 low water, and in rock pools between 

 tides. It is also frequently cast up alive 

 along the whole coast. Large specimens 

 are found in Newhaven Harbour, brought 

 in by the fishermen (M). 

 This species is frequently met with in 

 dredging in the Firth. We have taken it 

 to the east of Inchkeith, in 18 fathoms ; 

 west of Inchkeith, in 5 fathoms ; off 

 Fidra, in 7 fathoms ; and north-west of 

 the Isle of May, in 26 fathoms. 



M. adriaticus (Lamk.). 



Firth of Forth (E. F.). 



Modiolaria marmorata (Forb.). 



Off Elie (MR); Firth of Forth (Ed. 

 Mus.). Plentiful on Newhaven shore in 

 roots of Laminaria, after storms (M.). 

 Imbedded in the test of Ascidia virginea, 

 not uncommon in 5 to 10 fathoms, espe- 

 cially on the bank west of Inchkeith. 

 We have also taken it at low water at 

 Wardie. 



M. discors (Linn.). 



Firth of Forth (MR, and Ed. Mus). 



Living with M. marmorata in roots of 



Laminaria on Newhaven shore after 



storms. 



We have dredged this species in the Firth, 



and have also collected it at Portobello. 



M. nigra (Gray). 



Off Dudgeon (Thomas); Firth of Forth 

 (Ed. Mus., and MR). 

 I have a specimen from Mr Damon, 

 Weymouth, marked " Black Eocks, Leith." 

 I have sought for it at the lowest spring 

 tides, without success (M.). 



