NORTH AMERICAN CONCIIOLOGY. 



101 



Localitv. 

 Cordova, Vera Cruz. 

 Cordova, Vera Cruz. 



Cordova, Vera Cruz. 



Cordova, Vera Cruz. 



Cordova, Vera Cruz. 



Mexico. 



Cordova, Vera Cruz. 



Cordova, Vera Cruz. 



Cordova, Vera Cruz. 



Cordova, Vera Cruz. 



Au8 dem Jahre 1831. (March, 1S54.) 



Beitrage zur naheren Kentniss der Laud- und Siisswasser-Mollus- 

 keu der lusel Portorico. 



36 Helix vortex Pfr. Florida, &c. 



//. aeJeiiina Gould. 



37 minuscula Binn. Porto Rico. 



//. minuialis Mor. 

 43 varians Mhe. Florida, &c. 



H. poljjchroa Binn. 

 nuhmeris Migh. 

 46 Stenogyra subula Pfr., ^-c. 



52 Pupa servilis Gould. Florida, &c. 



53- fallax Pfr. = Bulimus nitidulus? 



96 Planorbis tumidus Pfr. Mexico, &c. 



98 Lymneus Cubensis Pfr. 



L. uinhilicotii Ad. ? 



99 Ancylus obscurus Hald. St. Thomas, &c. 



Pftifler. — Symbolfe ad Historiam Heliceorura, auctore Dr. 

 Lld. PfEiFFEB. Cassel, 1841. 



