30 RAMBLES IN SEARCH OF SHELLS. 



species in this genus are gregarious, and attract 

 more attention when clustered together than they 

 would do singly, we might look a long time before 

 finding them. The only two which, so far as we are 

 aware, have heen found in or near London, are Pupa 

 umbilicata and marginata, vel muscorum, (PL II., 

 fig. 3), both of which are partial to old walls and 

 roots, and may be looked for with a good chance of 

 success about the artificial rock or grotto work 

 with which many fern-growers are wont to ornament 

 their gardens. Mr. Rich informs us, however, that 

 Pupa secale, vel juniperi, (PL II., fig. 2) has been 

 met with on an old wall at Sudbury, near Harrow. 



We do not remember to have seen any species of 

 Vertigo from London gardens, although some of them 

 are far from rare, and, being of similar habits, are to 

 be found in similar situations to Pupa, of w T hich 

 genus they may be said to be miniature forms. The 

 animal of Vertigo, however, has but one pair of ten- 

 tacles, while Pupa has two pairs. The spire of the 

 shell is shorter, and the outer lip more contracted. 



To find some of the commoner kinds of Clausilia 

 and Bulimus, we must go to the woods and fields ; 

 for it would be vain to search the smoke-dried and 



