Crenella decussata 
OF THE FIRTH OF FORTH. bo 
(Mont.). 
Firth of Forth (J. @. J.). 
Single valves, and occasionally a perfect 
specimen, in drifted shell sand at North 
Berwick (JZ). 
ARCIDA. 
Nucula nucleus (Linn.). 
Firth of Forth (B., and Ed. Mus.). 
We have dredged this species off Largo 
Bay, and near Inchkeith, in 7 fathoms. 
N. nitida (Sowerby). 
N. tenwis (Mont.). 
Single valves of Nucula on this shore are 
usually of this species. I have taken per- 
fect specimens (which, however, did not 
contain the animal) at very low water, 
Craigroyston, and at Cramond Island (JL). 
We have dredged this species off Elie, and 
west of Inchkeith, in 5 fathoms, and have 
also collected it on the beach at Largo 
Bay. 
Firth of Forth (J. @. J.). 
Leda minuta (Miill.). 
Firth of Forth (£B., under the name of 
Leda caudata). 
Small single valves occur in the drifted 
shell sand at North Berwick. The pos- 
terior extension is short. They are either 
the var. brevirostris, or the young state of 
the species (JZ). 
Pectunculus glycimeris (Linn.). 
Firth of Forth (/‘B.). 
Occasionally in Newhaven Harbour, 
doubtless brought in by the fishermen 
(IL). 
Arca tetragona (Poli). 
Firth of Forth, rare (Flem., under the 
name of Arca fusca). 
