OF THE FIRTH OF FORTH. 89 
Trochus cinerarius (Linn.). 
Firth of Forth (ZB., and Ed. Mus.) ; beach 
between Portobello and Fisherrow (Metz. 
and Mey.). 
This is a very common species in the Firth 
about low water mark. It is abundant at 
Granton, Wardie, Aberdour, Elie, and other 
parts of the coast. We have also dredged 
it off Inchkeith in 5 fathoms. 
T. zizyphinus (Linn.). 
Firth of Forth (/B.). 
Not common here. I have found dead 
shells on the beach at Edinburgh and 
Dirleton (JZ). 
LITTORINID&. 
Lacuna crassior (Mont.). 
Firth of Forth (#d. Mus., and MB.). 
Not rare on the beach at Wardie, Granton, 
and North Berwick (JZ). 
L. divaricata (Fabr.). 
Firth of Forth (4d. Mus., and MB, as 
L. vineta). 
Common on Laminaria, etc., at Granton, 
North Berwick, Dunbar, and other places 
(I). 
L. divaricata, var. eanalis. 
With the species at North Berwick, etc., 
somewhat common at Granton (JZ). 
L. divaricata, var. quadrifasciata. 
On the beach at Leven, Fife (JZ). 
L. pallidula (Da Costa). 
Firth of Forth (£d. Mus., J. G. J.,and MB.). 
Common on Laminaria, etc., at Granton, 
North Berwick and Dunbar (JZ). 
We found this species in Largo Bay. 
Littorina obtusata (Linn.). 
Firth of Forth (4d. Mus., and MB.) ; 
