Foreign to the United States. 221 



prove the genus Leiicochvoa to l)e only a subgenus of Helix, 

 in the arranirenient of "Die Heliceen." 



Helix circaajMflD'BBisQta, Eed field. 



Lingual membrane long and broad, centrals tricuspid, laterals bicuspid, 

 cusps long and slender, marginals aculeate. 



From the above description it "will appear that this spe- 

 cies belongs to the Vitrinea rather than to the Helicea of 

 von Marten's arrangement, in which latter it is classed in 

 "Die Heliceen" as a species of the subgenus MicrojjJiysa. 



Helix BeriBHB«leMsis, Pfu. 



Jaw extreraelj' thin, arched, with a blunt, median projection to its 

 cutting edge. 



Lingual membrane long and narrow. Central teeth tricuspid, laterals 

 bicuspid; the cusps in each long and slender. Marginals numerous 

 aculeate in oblique rows. 



As in the II. circumfirmata , the result of our examina- 

 tion of the lingual membrane throws light on the generic 

 position of this species. It can no longer be retained in 

 Caracolus, a sub-genus of Helix, as it has the dentition of 

 the Vitrinea of von Marten's arrangement. For the speci- 

 mens examined of this and the preceding species, both from 

 Bermuda, we are indebted to Mr. J. J. Crooke. 



Saclix B»<?B'plexs4, Fer. (Dentdlana). 



Jaw with a median projection to its cutting edge. The anterior sur- 

 face of the jaw is of irregular thickness, showing some approach to the 

 ribbed form of jaw. 



Lingual membrane as usual. Central and lateral teeth with short, 

 stout, blunt cusps. Marginal teeth quadrate, with one wide, stout, bluntly 

 rounded median cusp, and two small, blunt side cusps. 



We are indebted to Governor Rawson for this specimen 

 collected in the Island of Grenada. 



