ODSERVATlONS. 



This is an inhnbitant of the middle and northern States 

 and is very common in many districts. I have found it in 

 Pennsylvania, Newjersey, Delaware, Maryland, Falls of 

 Niagara, Upper Canada and in the vicinity of Council Bluff 

 on the Missouri. Dr. Eights sent me specimens from Al- 

 bany, New- York, and Mr. Jessup gave several from Caj'U- 

 ga lake. Lister gives two pretty good figures of this shell 

 and quotes Virginia as the native locality. MuIIer, Gme- 

 lin and Dillwyn, incorrectly refered to Lister's figures a? 

 Helix albella, but the latter author in his edition of Lister 

 agrees with us in considering them as representations of 

 the present species. 



HEFERENCE TO THE PLATE. 



Fip. ?. Two viewf ; natural sire. 

 PI. C4. 



PLANOIJBIS BICARINATUS. 



DESCRIPTION*. 



Shell yellowish-white or brownish, suucarinale nbove 

 and beneath ; ichirk rather more than tliree, irregularly 

 wrinkled across and with minute revolvinc; lines ; spire 

 profoundly impressed, obconic ; ^/?fr///rc large, embracing 

 a considerable portion of the preceding volution ; lahrum 



PI. 54. 



