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- 

 denSj 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. tridenSj 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. 



Two 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. 



