CONCHOLOGY. 



Lamarck ; his genus Acbatina is composed in part from these. 

 Bulimus purpurescens is an example of this new genus. Having 

 entered so fully into the various changes which have been adopted 

 by naturalists in the classification of those shells, it will remain 

 with the reader to consider the propriety of following the new 

 order of science, by denominating the present shell Bulimus citrimiSy 

 or retaining it, as we have done, under the established denomination 

 of the Linnsean nomenclature. Helix perversa. As a trivial appella- 

 tion, perversa " is assuredly most applicable, since it comprehends 

 alike the striped or spotted, and the plain varieties, while that of Le 

 citrone (citrinus), which is destined to indicate the species in its spotted 

 as well as spotless state, is adopted only in reference to the colour of 

 those which are not spotted. It might, without any impropriety be 

 called Bulimus perversus^ by those disposed to admit that genus. 



The upper figure in the plate represent the deep yellow variety 

 called by some authors Helix aurea, or the perversae golden Helix : 

 the two figures below, the striped variety. 



VOL. II. 



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