UNIONID®. 65 
South. 
Ditches at Dunster and Minehead; ZL. FE. Adams and 
Charles Oldham. 
Dulverton ; H. Watson. 
PISIDIUM NITIDUM, Jenyns. 
Lakes and ponds. Local. 
North. 
“ A large pond by the side of the railway at the third (?) 
bridge from Clevedon” ; Norman. 
River Brue at Street; B. B. Woodward's List. 
Weston district; F. A. Knight. 
South. 
Between Minehead and Watchet; Adams and Oldham. 
PISIDIUM OBTUSALE, Pfezffer. 
Shallow ponds and in ditches. 
North. 
Avonmouth ; Cundall. 
“Tn a ditch near the Pill, Clevedon; also in the pond 
near the Royal Hotel”; Norman. 
Kennet Canal; Stoddart. 
South. 
Yeovil; J. Ponsonby. 
PISIDIUM GASSIESIANUM, Dupuy (= Pisidium roseum, Jeffreys 
non Scholtz; = Pisidium milium, Auctt. non Held). 
Ponds and pools. Uncommon. 
North. 
“Tn rhines near Burtle and also in a spring on Rowberrow 
Warren, near the south foot of Dolbury Camp; F. A. 
Knight. 
Weston district; F. A. Knight. 
In the larger rhines about Shapwick, Highbridge, etc. ! 
South. 
Between Minehead and Watchet ; Adams and Oldham. 
Ditch at Dunster in association with P. fontinale ; Adams 
and Oldham. 
