152 Binney 071 Terrestrial Mollusks. 



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 : — 



Aphdon Raf. Stenostoma Raf. 



Ajilodon nodosum Raf. Stenotrema Raf. 



Chimotrema Raf. Stenotrema convexa Raf. 



Chimotrema planiuscula Raf. 7oxostoma Raf. 



Hemiloma Raf. Toxostoma globularls Raf. 



Hemiloma avara Raf. Toxotrema Raf. 



3fesodon Raf. Toxotrema glohidaris Raf. 



Mesodon macidatum Raf. Toxotrema amiplanata Raf. 



MesompJiix Raf. Triodopsis Raf. 



Odompldum Raf. Triodopsis lunula Raf. 



Odotropis Raf. Trophodon Raf. 



Omplialina Raf. Xoloti-ema Raf. 



Omphalina cuprea Raf. ; vide Xolotrema lunida Raf. 



Helix fuliginosa. 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. Trols tours de spire bosseles, legerement rides con- 

 centriquoment en dessous. 



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

 genus Odomphium, by having an ombilic. 



Toxostoma globularis. Globular, smooth ; 5 spires. In Kentucky. 



Parlnla Olalieilana Fer., as observed in vol. i. p. 159, never 

 existed in the United States. 



FAMILY AURICULACEA. 



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

 this country, mentions that there is much reason to doubt 

 whether this family is truly Pncumo-branchiate. Con- 

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

 not include them in his work. 



