

«■ 



inhabiting the United States 



495 



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Geographical distribution. Noticed by mOj hith- 



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erto, only in the State of Vermont, on the eastern slope 



Mountains 



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Remarks. This species, now for the first time de^ 

 scribedj is not common in the localities which it inhabits. 

 Its distinguishing marks are, its flattened form, and the 

 tooth on the pillar lip, v 



While observing it with the animal retracted and the 

 collar just visible at the aperture, I have heard a sharp 

 snapping sound emitted, which seems to have some con- 

 nexion with the opening and shutting of the respiratory 

 foramen ; but in what manner it is produced 1 have not 

 been able to discover. The same is made by H. albola- 

 briSy H. thyroidusy and H. diodonta, and is probably 



L 



common to the genus. 





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