LAND SNAILS. 167 
twelve whorls; it is slender and thin, of a reddish 
or greyish-brown colour, with raised white lines ; 
there are two folds on the columella. 
C. biplicata is very rare, and was first described 
as British by Montagu. It may be found in 
some abundance under the larger osiers border- 
ing the banks of the river Thames about Ham- 
mersmith. In the winter it buries the front of 
the shell in the loose soil among the tufts of 
grass or at the base of the trees. It is also re- 
corded from two localities in Wiltshire. 
Crausinia LaMINata—(the Laminated Close 
Shell) (Pl. IX., fig. 87).—The shell is large, 
handsome, and at once distinguished by its 
polished appearance; it is usually semi-trans- 
parent, glossy, yellowish- or reddish-brown, and 
sometimes greenish-white and transparent. There 
are twelve whorls ; the aperture is oval, with two 
folds, from which latter character it is known 
as CU. bidens, one of them curved and situated 
on the middle of the columella-lip, and the other 
is straight and near the top of the aperture; in 
addition there are three or four folds deep within 
the aperture, which are visible from the outside, 
owing to the transparency of the shell. The 
shell attains a length of three-fourths of an inch, 
but it varies in size and colour. The dentition 
is thus :—Number of rows, 120 ; number of teeth 
in a row, 51; total, 6,120. 
