64 MOLLUSCA OF SOMERSET. 
PISIDIUM HENSLOWIANUM, Sheppard. 
Rare ? 
North. 
Leigh Woods; Wheeler. 
IXennet and Avon Canal; Stoddart. 
Clevedon ; Norman. 
Bratton St. Maur! 
PIsIDIUM SUBTRUNCATUM, Malm (= Pisidium fontinale, 
Jeffreys). 
This species is probably not so rare as the records would 
lead one to expect. 
North. 
Weston district: F. A. Knight. 
Bath Canal; Kenneth McKean. 
South. 
Ditch near Minehead ! 
PIsIDIUM PULCHELLUM, Jenyns. 
Rare, except in the extreme north of the county. 
There are specimens in the Museum at Bath that were 
collected by Jenyns in the vicinity of that city. 
“In the larger and clearer of the rhines not uncommon ; 
fine in West Mead Rhine, Yatton” ; Norman. 
PISIDIUM PUSILLUM, Gmelin (= Pisidium fontinale, Drapar- 
naud, of continental authors. 
A small species which is probably often passed over for 
young of larger ones, and is presumably more widely dis- 
tributed than the records indicate. Mr. Bolton found it in a 
shell-bearing deposit at Dumball Island, Avonmouth. 
North. 
“Common in grassy ditches, ponds and rhines. We have 
taken it of a very large size in the moor that stretches 
from Clevedon towards Portishead”; Norman. (It may 
be inferred that the large specimens were the variety 
grandis ; Adams). 
Avonmouth and Bedminster ; Cundall. 
Bath; Jenyns. 
Rhines about Highbridge and other places on the Levels ! 
Penselwood ! 
Weston district; #. A. Knight. 
