COCHLICOPA. 289 



were the Helix lubrica of Miiller, the Buccinum acicula 

 of the same author, the Bulimus octonus of Bruguiere, 

 and (subsequently) the Turbo tridens of Pulteney. I 

 see no reason for altering the opinion which I then 

 formed, so far as regards the first and last of these species : 

 but as the name of Cochlicopa is prior to mine, I have no 

 hesitation in substituting it for Cionella ; and I propose 

 to restore the Buccinum acicula of Miiller to the genus 

 Achatina. The Bulimus octonus of Bruguiere belongs 

 also to the last-mentioned genus. The Helix lubrica of 

 Miiller and Turbo tridens of Pulteney agree in all essen- 

 tial particulars, except in the latter being furnished with 

 teeth ; but it has been shown that in the genus Vertigo 

 some species are toothed and others toothless, and that 

 even an undoubted species of Helix {H. obvoluta) is pro- 

 vided with similar processes. Bulimus tridens, quadri- 

 dens, and other allied species may also be cited in illus- 

 tration of this view, although they do not occur in this 

 country. Cochlicopa tridens forms a passage from Clau- 

 silia to Achatina ; and it is connected with C. lubrica 

 through the Achatina dentiens of Rossmassler. Leach 

 proposed the genus Azeca for C. tridens, and the genus 

 Zua for C. lubrica ; but these generic names are of 

 recent manufacture. 



The tongue or lingual plate of Cochlicopa resembles 

 that of Bulimus ] and the members of the present genus 

 would therefore seem to be also herbivorous. They in- 

 habit wet and shady situations. 



The British species of this genus form two artificial 

 sections, which I propose to define, as in other genera, 

 from characters furnished by the shell. These corre- 

 spond with the genera Azeca and Zua of Leach. 



