152 AURICITLACEA. 



This concludes the list of known American Helicidae. 

 The following genera and species have been described by 

 Rafinesque, but are all included in the genus Helix : — 



Aplodon Raf. Stenostoma Raf. 



Aplodon nodosum Raf. Stenotrema Raf. 



Chimotrema Raf. Stenotrema convexa Raf. 



Ghimotrema planiuscula Raf. Toxostoma Raf. 



Hemiloma Raf. Toxostoma globidai'is Raf. 



Hemiloma avara Raf. Toxotrema Raf. 



Mesodon Raf. Toxotrema glohdaris Raf. 



Mesodon maculatum Raf. Toxotrema complanata Raf. 



Mesomphix Raf. Triodopsis Raf. 



Odomphium Raf. Triodopsis lunula Raf. 



Odotropis Raf. Trophodon Raf. 



Omphalina Raf. Xolotrema Raf. 



OmphaUna cuprea Raf. ; vide Xolotrema lunula Raf. 



Helix fuUginosa. Xolotrema triodopsis Raf. 

 On vol. i., p. 48 et seq. will be found a reprint and translation of 

 Rafinesque's descriptions. The following, omitted by Binney, will 

 make the series complete : — 



Aplodon nodosum. Trois tours de spire bosseles, legerement rides con- 

 centriquement en dessous. 



The genus Trophodon differs from Mesodon by upper lip notched. The 

 genus Odomphium, by having an ombilic. 



Toxostoma (jlohularis. Globular, smooth ; 5 spires. In Kentucky. 



Partula Olaheilana Fer., as observed in vol. i. p. 159, never 

 existed in the United States. 



FAMILY AURICULACEA. 



Dr. Binney, in his work on the Terrestrial MoUusks of 

 this country, mentions that there is much reason to doubt 

 whether this family is truly Pneumo-branchiate. Con- 

 sidering its species to be, at all events, aquatic, he does 

 not include them in his work. 



