192 TREGELLES : MARINE MOLLUSCA OF CORNWALL. 
Taking West Cornwall in detail we find recorded for 
Falmouth and Helford ... ... 285 species. 
Mount Si anypeume eke 260 dao. 
Land’s End Ae Poteuneem BOOn dO: 
avlerandeStemlvecsiay ee cmece 150 do. 
Plymouth Sound, which, strictly speaking, is common to 
Devon and Cornwall, has been well studied by the officials of the 
Marine Biological Laboratory ; but, naturally, they do not give 
much attention to the specific distinctions of molluscs. Whit- 
sand Bay, Looe, Polperro, Fowey, and Goran have all been 
worked, but not exhaustively, and they will repay closer exam- 
ination. 
Falmouth and Helford offer so much variety—estuary, 
land-locked harbour, and open sea—that the record of species 
for that locality is large. Mount’s Bay is at first sight dis- 
appointing—there are so few shells on the beaches; but the 
rock-pools and dredging yield very good results, and trawlers 
bring in some valuable species if they can be persuaded to save 
any of their “rubbish.” Porthcurnow beach, near the Land’s 
End, is mainly composed of small shells, broken and whole, 
and dead specimens of many species can be obtained there 
(Lrvilia castanea Mont. being characteristic) when wind and 
tide are favourable. There must be a considerable nursery out- 
side, but no one, I believe, has hit on the exact source of this 
inexhaustible supply. Whitsand Bay (Land’s End) is similar, 
but the beach is much larger, and the shells more scattered. 
Hayle beaches are often strewn with shells, chiefly bivalves ; 
Loripes commutatus Ph. and the rare AZactra glauca Born are 
oceasionally found there. 
From thence, north-eastwards, the coast 1s very barren ; 
broad surf-beaten beaches alternate with beetling cliffs, and few 
species of shells are to be found on the shore, whatever dredg- 
ing outside might yield. A few species have been obtained 
near Padstow, and probably that piece of coast is worth attention. 
J.C., viti., April 1896. 
