72 THE INVERTEBRATE FAUNA 
Mytilus modiolus (Linn.). 
Firth of Forth (£B., 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 (JZ). 
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 (£. F). 
Modiolaria marmorata (Forb.). 
M. discors (Linn.). 
M. nigra (Gray). 
Off Elie (MB); Firth of Forth (£d. 
Mus.). Plentiful on Newhaven shore in 
roots of Laminaria, after storms (JZ). 
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. 
Firth of Forth (B., 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. 
Off Dudgeon (Zhomas); Firth of Forth 
(Hd. Mus., and M‘B.). 
I have a specimen from Mr Damon, 
Weymouth, marked “ Black Rocks, Leith.” 
I have sought for it at the lowest spring 
tides, without success (JZ). 
