122 PNEUMONOBRANCHIATA. 



founded on a single dead specimen, it is to be hoped 

 Mr. Jeffreys may be able to obtain additional speci- 

 mens, and in a living state, in order fully to establish 

 it." 



Mr. Alder having communicated to me the specimens 

 referred to above, after careful examination, I have 

 come to the same conclusion : indeed, V. Draparnaudi 

 appears to be hardly a variety ; and a specimen which 

 Mr. Alder thinks is like V. Dillwynii of Mr. Jeffreys, 

 appears chiefly to differ in the altered appearance and 

 character which two shells of different degrees of opa- 

 city assume, when compared together. 



Dr. Turton appears to have inserted Vitrina clon- 

 gata of Draparnaud, on Mr. Jeffreys' authority. Mr. 

 Alder observes that no such shell is now found in Dr. 

 Turton's cabinet. 



Dr. Fleming first observed this species in Britain ; 

 for he says that he sent it to the late Mr. Montagu 

 in 1809, who considered it as the fry of the Helix ni- 

 tida. Brown described it as British in 1819, and it 

 was noticed as English by M. Ferussac and myself 

 in 1820 and 1821. 



Captain Brown, in his British Shells, figures two 

 shells, one of which he calls Vitrina membranadea, t. 

 40. f. 3, 4, 5., and the other Vitrina margaritacea, t. 40. 

 f. 54, 55, 56., which I have not been able to see. The 

 latter is more like a Zonites than a Vitrina. 



The animal is very hardy ; for, according to Nilson, 

 it is found crawling about amongst leaves in the 

 southern part of Sweden in the depth of the winter ; 

 and it is also found in the most northern part of that 

 pountry. 



