LAND SNAILS. 161 
VertTico ALPEstRIs—(the Alpine Whorl Shell) 
(Pl. IX., fig. 88)—differs from the last species, 
and is regarded by many asa variety of it, in 
being more cylindrical, of a paler colour, slightly 
striated, and in the absence of any rib, either 
inside or outside, to the mouth. 
Messrs. Forbes and Hanley say, ‘‘ It may be 
taken in great numbers by laying a piece of old 
wood upon the grass at nightfall, and examining 
it in the morning.” 
It occurs in a few places in Cumberland, Lan- 
cashire, and Northumberland; at Over, Glou- 
cester, and among moss on the canal banks at 
Sharpness (Mr. J. Jones) ; and is sparingly dis- 
tributed in North and Central Europe. 
VERTIGO ANTIVERTIGO—(the Marsh Whorl Shell) 
(Pl. X., fig. 103).—The shell of this species is 
dextral, and is not reversed, as in some others 
of the genus; it is of an oval form, thin, shghtly 
polished, and of a brown colour; whorls five ; 
the aperture is small, subtriangular, with a 
whitish margin, and provided with three unequal 
folds above on the pillar, and three on each side. 
A very appropriate specific name given to this 
snail was palustris, as denoting that it was an 
inhabitant of marshy places, about the roots of 
plants; it is also to be met with under stones 
on the banks of streams and lakes, even in 
elevated situations. Though an inhabitant of 
M 
