110 On the Land and Fresh Water Mollusca 



Bulimus Clavulus, Turt. cannot be considered a native species. 

 It appears, however, to have spread beyond the limits of Mr Miller's 

 nursery at Bristol, as Mr Williamson of the Manchester museum, 

 showed me specimens obtained from a garden in that neighbourhood. 

 B. Decollatus, Drap. is similarly situated, and has even less claim 

 to be considered as British. Dr Turton introduces B. articulatus, 

 Lam., and B. ventricosus, Drap. into his Manual, and informs us that 

 they were sent to him " from the plains about Penzance, in Corn- 

 wall ;" but by whom found or transmitted to him we are not inform- 

 ed. B. articulatus, Lam. is, according to M. de Ferussac, a varie- 

 ty of B. acutus ; and if he was right, which there is no reason to 

 doubt, in the specimens he gave me under that name, it is certainly 

 an inhabitant of this country, but not a species. Dr Turton 's shell, 

 however, now in the cabinet of William Clark, Esq. of Bath, is of 

 another and very distinct species, not known, I believe, to inhabit 

 Europe. Some more satisfactory information must, therefore, be ob- 

 tained before admitting this, or the B. ventricosus, into the British 

 list. Bulimus tuberculatus, Turt. appears to have been introduced 

 by some mistake of Captain Blomer, who, I am afraid, was net suffi- 

 ciently careful in keeping his English and Foreign specimens sepa- 

 rate from each other. 



Gen. 9. Achatina, Lamarck. 



1. Acicula, Mull, Lam. 



2. Lubrica, Mull. Mich. 



Most modern authors (Ferussac, Michaud, Mencke, Jeffreys, 

 and Bouillet,) agree in detaching this species from Bulimus. Its 

 close affinity to Achatina foliculus, Lam. points out its place in this 

 genus, but it forms a link between the two. Perhaps Mr Jeffreys's 

 genus Cionella ought to be adopted for this section of Achatina. 



A. Octona has no real claim to be considered as British. 



Gen. 10. Azeca, Leach. 

 1. Goodalli, Fer. Aid. 



Gen. 11. Clausilia, Draparnaud. 



1. Bidens, Mull. Drap. 



Turbo laminatus, Mont. 

 The specific name of Bidens has become rather ambiguous on ac- 

 count of having been applied by Linnaeus and Muller, to two dis- 

 tinct species. The weight of authorities, however, is so much in fa- 

 vour of retaining it for this species, that I hesitate not to do so. 



2. Veniricosa, Drap. 



T. biplicatus, Mont. 



