PUPA. BULIMUS. AURICULA. 69 



saw them just now. We shall find Helix in two 

 other families. 



" Pupa is a curious genus. The shells re- 

 semble a crysalis. A few minute species are 

 found in Britain. P. muscorum I have found 

 buried among damp moss. The larger species are 

 natives of tropical regions. These shells are often 

 found decollated, 



" Clausula papillaris is a pretty^ shell. 

 (Plate 9.) 



" Clausilia rugosa is found in some parts of 

 Britain, under old hedges, at the foot of old 

 trees, and similar places. It is a tapering shell, 

 with the aperture reversed, or left-handed, and 

 bi-dentated : the colour red-brown. It is to be 

 found in the vicinity of Dorking, in Surrey. 



'' Bulimus is a large genus. A common small 

 speciesis the Gaudaloupe Bulimiis, 



"The largest land-shells are found in the genus 

 Achatina. The greater number are African. 



" Succinea contains a few species. One of 

 them, ^S*. aniphibia^ is common near fresh- 

 water. 



" Auricula has some resemblance to a Voluta. 

 The aperture is longitudinal: the columella has 

 one or more folds. 



" The forms of the species in Cyclostoma are 

 variable ; but the aperture is circular, and the 

 margin revolute, or rolled back. C. elegans is 



