AMPHIPEPLEA. 
215 
Limneus involutus. Harvey MSS, — Spire sunk 
within the outer whorl; aperture very large, 
extending to the apex. 
A few specimens of this beautiful shell were col- 
lected by my friend William Henry Harvey, Esq., 
of Limerick, in a small alpine lake on Cromag- 
laun Mountain, Killarney, in the month of April, 
1832 ; and believing them to be of a new species, 
were by their discoverer designated by the above 
name. 
Of three specimens sent to Belfast by Mr. 
Harvey, and contained in my own cabinet and in 
those of Dr. Drummond and Mr. Hyndman, the 
largest is 5^ lines in length and 3^ in breadth ; volu- 
tions four, the largest enveloping the other three, 
none of which are visible in the profile of the shell ; 
aperture very large, wide at the base (showing the 
columella throughout its entire length), and extend- 
ing to the apex; margin reflected only where it joins 
the pillar. 
Shell polished, extremely thin, of a pale amber 
colour, with coarse longitudinal stris 0 . It approaches 
L, glutinosus more nearly than any other species ; 
but in consequence of the aperture extending to the 
apex, has, at a cursory view, a greater resemblance 
to Bulla akera than to any other British shell, 
their similarity being rendered still more striking by 
the columella having the same appearance in both 
species.” 
Amphipeplea luzonica^ which has the greater part 
of the shell covered with the mantle, even in the ani- 
mals preserved in spirits, much resembles this species. 
