282 Proceedings of the Royal Physical Society. 



Crenella decussata (Mont.). 



Firth of Forth (J. G. J). 

 Single valves, and occasionally a perfect 

 specimen, in drifted shell sand at North 

 Berwick (IT.). 



Nucula nucleus (Linn.). 



Firth of Forth {MB., and Ed. Mus). 

 We have dredged this species off Largo 

 Bay, and near Inchkeith, in 7 fathoms. 



N. nitida (Sowerby). 



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 {M.). 

 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. 



N. tenuis (Mont.). 



Firth of Forth {J. G. J.). 



Leda minuta (Mull.). 



Firth of Forth {M'B., under the name of 

 Zedct caudata). 



Small single valves occur in the drifted 

 shell sand at North Berwick. The pos- 

 terior extension is short. They are either 

 the var. hrevirostris, or the young state of 

 the species (if.). 



Pectimculus glycimeris (Linn.). 



Firth of Forth (M'B.). 



Occasionally in Newhaven Harbour, 



doubtless brought in by the fishermen 



(if.). 



Area tetragona (Poli). 



Firth of Forth, rare {Flem., under the 

 name of Area fiosca). 



