of Great Britain. Ill 



Ferussac originally referred T. biplicatus, Mont, to C. ventricosa, 

 Drap., but he afterwards adopted the opinion that they were distinct. 

 The British shell is more slender and spindle-shaped than the 

 continental one, but the difference scarcely amounts to any thing 

 more than a variety. 



3. Rotpkii, Leach. 



Distinct from C. plicatula, Drap., to which it has been refer- 

 red. 



4. Dubia, Drap. 



Found in several places in the north of England. 



5. Rugosa, Drap. 



var. C. parvula, Turt. 



The C. parvula of Dr Leach, (specimens in the British Museum,) 

 of Mr Jeffreys, and of Dr Turton, all belong, I think, to the same 

 variety of C rugosa, and not to C. parvula of Studer. 



Turbo labiatus, Mont. (Clausilia solida, Drap.) has long stood in 

 our British catalogues. It is stated to have been found in the neigh- 

 bourhood of London about fifty years ago. The localities named 

 are Hyde Park and Battersea Fields, but it is not now to be found 

 in either of those places, and as the shells of this genus resemble 

 each other very closely, it is probable that there may be some mistake 

 in the species noticed. C. ventricosa is not uncommon at the roots of 

 willows in Battersea Fields. The only specimens of C. solida, Drap. 

 now in collections of British shells, appear to have come from the 

 cabinet of Mr Humphreys, but the evidence of their native origin is 

 not very satisfactory. C. papillaris, Drap. (C. bidens, Turt.) has 

 also obtained a place among our native species. On this subject Mr 

 Forbes has favoured me with the following very satisfactory informa- 

 tion. He says, " I have lately obtained a manuscript copy of Las- 

 key's North British Testacea, written by himself, which fully ex- 

 plains the history of the British Clausilia papillaris. He states that 

 it was found by him in Granton Park, near Edinburgh, and that it 

 was imported from abroad in moss round the roots of some exotics." 

 Turbo (Clausilia) Everetti, Miller, is a variety of C. rugosa. 



Gen. 12. Balea, Gray. 

 1. Fragilis, Drap. Gray. 



Gen. 13. Pupa, Draparnaud. 



1. Umhilicata, Drap. 



2. Marginata, Drap. 



3. Anglica, Fer., Aid. 



4. Secale, Drap. 



