208 
MOLLUSC A OF NORTH STAFFORDSHIRE. 
Sep., 1889. 
DREISSENIDiE. 
DREISSENA. 
12.—Dreissena polymorpha 
GASTEROPODA. 
NERITIDiE. 
NERITINA. 
13.— Neritina fluviatilis 
,, ,, v. cerina 
Walls of Canal, Colwich, very fine, 
with a variety, with a white line 
down the centre of each valve 
(J. R. B. M.), Stafford (F. B. W.) 
Canal, Colwich (J. R. B. M.) 
Ditto Milford (L. E. A.) 
PALUDINIDiE. 
PALUDINA. 
14.—Palndina vivipara Canals everywhere. 
J ? 
5 * 
5 J 
BYTHINIA. 
15. —Bythinia tentaculata Common all canals and rivers. 
v. zonata^ ' River Sow > Stafford (L. E. A.) 
m. decollation Stone Canal (J. R. B. M.), Stafford 
(L. E. A.) 
16. ,, Leachii Ditto, Canal, Haywood (L. E. A.) 
VALVATIDiE. 
YALYATA. 
17.—Valvata piscinalis 
18. 
55 
55 
cristata 
Canal, Stone, Froghall and river 
Colwich (J. R. B. M.) 
v. acuminata Stafford (L. A. A.) 
Stafford (F. B. W.) 
LIMNiEIDiE. 
PLANORBIS. 
19.—Planorbis nitidus 
20. ,, nautileus 
21. ,, albus 
22. ,, spirorbis 
23. 
24. 
25. 
26. 
vortex 
carinatus 
complanatus 
corneus 
27. ,, contortus 
PHYSA. 
28. —Pliysa hypnorum 
29. ,, fontmalis 
,, ,, v. inflata 
v. curta 
Stafford (E. D. B.), Canal, Oaka- 
moor (T. F. B.) 
Maer Pool (J. R. B. M.), Stafford 
(L. E. A.) 
Pools and streams generallv. 
Stafford, Stone (F. B. W.), Froghall 
(T. F. B.) 
Ditto, very common, 
Fairly common, canals, &c. 
Very common. 
Local—Canal, Stone (J. R. B. M.), 
River Sow, Stafford (L. E. A.) 
Canal and river.Stafford,Newcastle, 
Froghall (T. F. B.) 
Stafford (L. E. A.) Burton-on-Trent 
(Dr. Mason.) 
On weed in running streams. 
Cheadle (J. R. B. M.), river, Stafford 
(E. D, B.) 
Stafford (L. E. A. 
