66 
The Irish Nairn alist. 
March, 
Succlnea elegrans, Risso. — MuUaghderg l/ougli, Carnboy Lough, 
Horn Head, and shores of Sessiagh Loiigh. AH the specimens were 
small and dark, and seem referable to the S. Pfeifferi of continental 
authorities. 
Carychium minlmunn, Mull. Common in all damp situations and 
in all shell-pockets. 
LI m naea au ricu lar ia, Iv.— The var. acuta of this species occurred rather 
sparingly in MuUaghderg and Carnboy Loughs. Some of the speci- 
mens from both localities were also var. albida, Jeff. 
L. peregra, Miill. — Common in all lakes and ponds. A very peculiar 
variety was found in Carnboy Lough, on the Carrickfin peninsula. 
Many of the shells were pure white, and some [see Plate 2] closely 
resemble var. Boissii, Dupuy. The shells in many lakes in this district 
show an inclination to the same form, and there are some similar 
specimens in the Dublin Museum, collected by R. Patterson in Lough 
vSalt. 
L. palustrls, Miill. — Plentiful in MuUaghderg, not seen elsewhere. 
L. truncatula, Miill. — Generally common. 
Planorbis spirortois, L. — Common in shallow parts of MuUaghderg, 
Dunlewy, and Carnbo}' Loughs. Also in many of the small lakes 
near Middletown, Bunbeg. 
P. contortus, I/. — Two dead shells in MuUaghderg Lough ; probablj^ 
common. 
P. crista, L. — Very common in all lakes at Middletown, and also in 
MuUaghderg and Carnboy Loughs, with var, natitilciis. 
P. grlaber, Jeff. — MuUaghderg, Carnboy, Middletown, and Sessiagh 
Loughs, common and very large. L- K. Adams gives 3^ mm. as the 
standard size, but many of the specimens taken reached 5 nnn. in 
diameter. 
Ancylus fiuviatilis, Miill.— Common, but very young, in Dunlewy 
Lough. 
Acme lineata, Drap.— Owing no doubt to want of time, this shell was 
not found alive, but was plentiful in shell-pockets at MuUaghderg, 
Carrickfin, and Horn Head. 
Vaivata piscinalis, Miill,— Only seen at Sessiagh Lough, very young. 
V. crlstata, Miill.— Very common in MuUaghderg Lough, and in Kil 
Lough near Dunfanaghy. 
Unio margaritif cr, L — Very abundant in Clady River, Bunbeg. In 
dry weather when the river is low, the people from the surrounding 
country come to search for pearls, as the banks of the river amply 
testify, being covered with great numbers of valves. We succeeded 
in getting five small dark brown pearls and five or six pieces of pearly 
substance, from a single shell. The largest of the brown pearls was 
almost one-eighth of an inch across. 
Plsidlum fontlnalc, C. Pfr.— MuUaghderg and Dunlewy Loughs. 
P. milium, Held,— MuUaghderg Lough, rare. 
P. obtusale, C. Pfr.— MuUaghderg Lough, common. 
P. pus! Hum, Gmel.— Generally distributed. 
P, nitldum, Jenyns.— Common in lough below Dunlewy House, 
