177 



cies named, which appear to have escaped his obser- 

 vation; he also describes the aperture to be of a 

 circular form, having probably included the thin ex- 

 panded portion of the lip which lies on the spire, it 

 otherwise must be considered more semicircular than 

 round. It is much to be regretted that the animal has 

 not yet been examined or described, as it certainly, in 

 its organization and habits, must differ from all other 

 molluscae: the formation of the shell appearing to indi- 

 cate, that, on the completion of the last whorl, with the 

 reflected, thickened, and dentated lip, the animal would 

 be obliged to carry its dwelling with the spire down- 

 wards; while, in a younger stage of growth, it is sup- 

 posed, like all other Helices, to present the spire up- 

 permost, and inclined to one side. Sowerby concurs 

 in this opinion, which however at present can only be 

 considered hypothetical. 



Anostoma depressa Anostoma globulosa. 



