88 THE INVERTEBRATE FAUNA 
the same relation to the species as the 
variety cwrulea does to Patella vulgata (JL). 
This species is common on the shores of 
the Firth. We have taken it at Aberdour, 
Wardie, ete. 
Tectura virginea (Miiller). 
Firth of Forth (M‘B., Ed. Mus.) ; Dunbar, 
at North Berwick living on the rocks at 
very low water (JZ). 
FISSURELLID. 
Emarginula fissura (Linn.). 
Firth of Forth (#d. Mus.); empty shells 
on North Berwick beach (JZ). 
We have found this shell on the beach at 
Largo Bay. 
CAPULID&. 
Capulus hungaricus (Linn.). 
Alive off Inchkeith, May 1861 (/‘B.); off 
Inchkeith (Com. Mar. Zool.) ; small empty 
shells on North Berwick beach (JZ). 
We have dredged it alive several times in 
the Firth—Aberlady Bay, 9 fathoms; and 
east of Inchkeith, 7 fathoms. We have 
also found it cast ashore on Portobello 
beach. 
TROCHIDA. 
Trochus helicinus (Fabr.). 
Not rare in shell sand at North Berwick 
and Dunbar (JZ). 
T. magus (Linn.). 
I have found a worn shell on Craigroyston 
beach, but I do not suppose that this 
species inhabits the Firth of Forth (JZ). 
T. tumidus (Mont.). 
Firth of Forth (LB., and Ed. Mus.). 
We have taken this species in 7 fathoms, 
off Inchkeith. 
