LAND AND FRESHWATER SHELLS OF THE DISTRICT. 105 
Name. | Occurrence. Locality. 
HELICIDA.— Continued. 
Balia perversa, Zinmé ....*| Common ..| Rossett (G.S. 
Clausilia rugosa, Drap. ....*| Abundant | Gresford (G.S), Mold (R.W) 
“ », var. albida ,.| Rare...... Rossett (R.W.) 
», laminata, MJontagu...,| Rare...... Hope (E.H.A.) 
», biplicata, ” Bere EMAL 3 cvccr ers Liandulas (E.H.A.) 
Cochlicopa tridens, Pulteney | Limited ..| Gwernymynydd (G.S), Gres- 
ford (R.W.) 
», lubrica, Miller ...... *! Common ..| Gresford (G.S.) 
Achatina acicula, AZiiller....| Local ....| Navigation Cop (G.S.), Ros- 
sett (R.W.) 
CARYCHIID. 
Carychium minimum, JZi/er*| Common ..| Blacon Point (G.S.), Mol- 
lington (R.W.) 
CYCLOSTOMATID&. 
Cyclostoma elegans, Miiller | Limited ..| Trevor Rocks (G.S.), Minera 
(E.H.A.), Valle Crusis 
Abbey (E.H.A.), Talar- 
goch (A.O.W.) 
Acme lineata, Draparnaud | Very rare..| Blacon Point (G.S.) 
REMARKS. 
ANODONTA CYGNEA.—In one locality on the borders of Flint- 
shire they occur of large size—6°85 X 3°50. 
UNIO MARGARITIFER.—This occurs in the Dee from Bangor 
Isycoed to Bala. All that I have seen have been small 
in comparison with those from the Conway River. 
DREISSEXA POLYMORPHA.—I collected this from the Canal with 
BELLaRS in 1856. My opinion is that it is more abundant 
now in the Canal than formerly. I have found them 
clustered together on a stone after the fashion of the 
young growth of Mytilus edulis. They are all of small 
size. It is rarely that one of typical size is met with. 
TESTACELLA HALIOTIDEA, VAR. SCUTULUM.—This variety is 
now found in some grassy lanes adjoining extensive 
Nursery grounds. There is the probability of its having 
been introduced, but it is now acclimatized. 
CocHLIcopA TRIDENS.—In “British Conchology”’ it is said not 
to have been found in North Wales. We have found it 
in several localities, usually on the Carboniferous Lime- 
stone, or on damp mossy banks. 
LIMNZA STAGNALIS.—We find it in many localities, but only in 
one locality does it approach the typical character in size. 
HELIX ASPERSA.—Altogether absent in the higher table lands 
of North Wales. Mr. Ruppy reports that in the neigh- 
bourhood of Bala, with an altitude of 600 feet, and after 
careful searching extending over years, he has only met 
with two specimens, and these were believed to have 
been introduced with some plants. 
SPHERIUM OVALE.—Of this scarce but elegant shell we have 
taken 50 specimens from one locality in the Canal. 
