re: MOLLUSCA OF SOMERSET. 
sandstone, all of which this species excavates. . . . The extent 
of its geographical range is almost unparalleled in the history 
of the Mollusca. It appears to have spread over the greater 
part of the globe, from one pole to the other” ; Gwyn Jeffreys. 
An insignificant looking species, but of great interest on ac- 
count of its boring propensities. ; 
Clevedon and Minehead ! 
PHOLADIDA:. 
PHOLAS DACTYLUS, Linné. 
This species bores into chalk, slate rock, new-red sandstone, 
marl, peat and submarine wood in the South of England, 
Bristol Channel, ete., burying itself 8, 10, or even 12 inches. 
Clevedon ! 
BARNEA CANDIDA, Linné (=Pholas candida, Linné). 
Differs from the preceding in being more convex and thinner, 
and having a single shield instead of four. 
Weston-super-Mare; F. 4. Knight. 
TEREDINIDZ. 
TEREDO MEGOTARA, Hanley. 
This species is found not infrequently in floating timber (fir) 
washed ashore during the equinoctial gales on various parts of 
our coast, including the Bristol Channel. 
DENTALIID&. 
DENTALIUM VULGARE, Da Costa (=D. tarentinum, Lamarck). 
W eston-super-Mare ! 
PATELLIDZ2. 
PATELLA VULGATA, Linné. 
The common limpet. On rocks and stones between tide- 
marks; one of the commonest and most plentiful of British 
marine shells. Much prized as an article of food by pre- 
historic man: shells are abundant in “kitchen middens” on 
the coast in many parts of Britain. Mr. St. George Gray 
records it from the excavations at Wick Barrow, Stogursey. 
Mr. Joseph Sinel records! some experiments which he carried 
1. ‘Outline of the Natural History of our Shores,” p. 203. 
