LIMNAA. 124 
and Westmeath, but it is found neither in Scotland nor 
Wales. 
It has the peculiarity of suddenly disappearing and 
reappearing without any known reason. 
Var. I. mucronata (Jef.). Spire more produced. 
Var. II. dbida ( Williams). White. 
Genus.—LIMNEA Lrugutere. 
Shell conic-oval or elongated ; sfzve usually produced ; dextral. 
Sub-genus.—RAvD1x Montfort. 
I. L. INVOLUTA ([spzre] enveloped [by whorls]) Thompson. 
Pl, VEL i 2 
Oval, very thin, glossy, transparent, pale amber; whor/s 3 to 4, 
convex ; sfeve sunk; apex distinct; oth pear-shaped. A. 10 mm. 
Bo7 mm. 
This beautifully delicate shell is probably a variety 
of LZ. peregra. Its only habitat is in a tarn on the Crom- 
aglaun Mountain seven miles from Killarney on the road 
to Kenmare. 
Mr Laylor says: /().°C., vol. VL, p. 286), “though it 1s 
probable that Z. zzvoluta is, like ZL. burnett’, only an 
extreme variety of Z. sevegra, the fact has not yet been 
fully and satisfactorily demonstrated.” 
2. L. PEREGRA (wandering) Miller. Pl VILI., f. 3. 
Obliquely ovate, thin, moderately glossy, yellowish horn-colour ; 
whorls 4% to 5, convex ; sfzve produced and pointed $ széure rather 
deep ; mouth three-fourths of the total length, oval; zazmer lip 
folded on the columella. A. 183mm. B. 143 mm. 
