LAND AND FRESHWATER MOLLUSCA OF MAYO AND SLIGO. 29 
Fam. VALVATIDS. 
Valvata piscinalis. The Common Valve Shell.— Generally 
distributed. 
V. cristata. The Crested Valve Shell.—I have obtained this 
species in two places only, viz., in a pond at Dooneen, Sligo, 
where it is plentiful; and in a slow stream near Enniscrone, 
Sligo, where I have found a few specimens. 
Order PULMONOBRANCHIATA. 
Fam. Limn2z1pDz&. 
Planorbis nautileus. The Nautilus Coil Shell. — Somewhat 
rare. I have taken a few shells in Raroneen Lake, Mayo, and 
the var. cristata in a slow stream in Castletown demesne, Sligo. 
P. albus. The White Coil Shell.—Cloonagh Lough only. 
P. glaber. The Smooth Coil Shell.—Very rare. I have only 
procured it on one occasion, when I found two or three in a slow 
stream near Enniscrone, Sligo. 
P. spirorbis. The Round-spired Coil Shell.—Very common 
in old bog-drains. 
P. contortus. The Twisted Coil Shell—Common and gene- 
rally distributed. 
Physa hypnorum. The Slender Bubble Shell. — Extremely 
abundant in an old bog-drain near Castletown, Sligo. The 
specimens met with, however, are all of small size. The largest 
I have seen here were given me by Capt. W. K. Dover, taken by 
him from a deserted quarry-hole at Knockroe, Sligo. 
P. fontinalis. The Stream Bubble Shell. — Generally dis- 
tributed. 
Limnea peregra. The Wandering Mud Shell.— Common 
everywhere. 
L. stagnalis. The Pond Mud Shell.—Generally distributed. 
L. palustris. The Marsh Mud Shell.—Common. 
L. truncatula. The Truncate Mud Shell.—General, though 
not plentiful. 
Ancylus fluviatilis. The River Limpet.—In several localities 
on and under stones in shallow water as well as on submerged 
leaves. 
