OF THE FIRTH OF FORTH. 91 
Rissoa costata (Adams). 
Common in the shell sand at North Ber- 
wick and Dunbar (JZ). 
fi. parva (Da Costa). 
Firth of Forth (2.). 
Not so common as the variety iterrupta. 
Good specimens at North Berwick and 
Dunbar (JZ). 
RL. parva, var, interrupta. 
Very common on seaweeds at low water 
at Granton, North Berwick, etc. (JZ). 
We have found this variety on the shore 
near Aberdour. 
f. striata (Adams). 
Firth of Forth (/2.). 
Alive among small seaweeds in rock pools 
at low water, North Berwick. Common 
in shell sand at Dunbar, North Berwick, 
Belhaven, Granton, etc. (JZ). 
We have found it in sand at Elie. 
R. striata, var. arctica. 
Occurs with the species, but is less com- 
mon (JZ). 
R. vitrea (Mont.). 
Rare in the shell sand at North Berwick 
(W.). 
It has been found at Dunbar by Bingham. 
R. semistriata (Mont.). 
Firth of Forth, 7 fathoms (7. and #.). 
Common in the shell sand at North Ber- 
wick (J). 
R. cingillus (Mont.). 
North Berwick, in the shell sand, but not 
plentiful (JL). 
We obtained this species on the shore near 
Largo. 
Hydrobia ulve (Penn.). 
Alive at Pefferburnfoot, Aberlady; dead on 
the beach at Cramond, Newhaven, North 
H 
