220 HALF-HOURS IN THE GREEN LANES. 



and has a large umbilicus, or hollow in the centre 

 underneath. The mouth is nearly circular. The 

 animal is very sensitive and sluggish, and it appears 

 to be especially harmed by excessive showers of 

 rain. The Lapidary snail (H. lapieida, Fig. 167), or 

 " Stonecutter," obtained its name because Linnaeus 

 thought it had the power of excavating into lime- 

 Fig. 166. 



f* 



Heath Snail (//. ericetorum). 

 Fig. 16v. 



Lapidary Snnil (//. lapicida). 



stone. The shell is lens-shaped, and the edge of 

 the diameter is sharp and keeled. The colour is a 

 yellowish-red. It is very abundant on the chalk 

 and limestone, and may also be found in w >odland 

 districts. The shell grows to the diameter of one inch. 

 The Bounded snail (H. rotundata, Fig. 168) is also one 

 of our commonest land snails, and may be found 

 under stones in damp woods, among fallen leaves, on 

 rocks, and in many other places; but most abun- 



