254 I-1ELICIDJE. 



GEOGRAPHICAL DISTRIBUTION. Inhabits the Middle 

 States and Ohio, and without doubt may be found in 

 other States. 



REMARKS. This shell does not correspond exactly 

 with Say's description ; but I think it is the same that 

 he described under this name. Having received, from 

 different localities, suites of them, of different sizes, I 

 notice that the " umbilicus small, orbicular, profound," 

 of Say, exists only in young specimens, it being closed 

 in the full grown shell. 



It resembles the preceding species, but has one whorl 

 less, is more depressed, and its base is more convex. 

 The tooth in the aperture is sometimes so little prominent 

 as to be hardly visible ; at other times there are three 

 teeth. The striae of growth are fine and crowded, and 

 seem to be more nearly at right angles with the suture 

 than is usual in other species. 



76. HELIX LASMODON, PHILLIPS. 



PLATE XXXVII. FIGURE 2. 



H. testa parva, depressa, umbilicata, cornea, nitente ; an- 

 fractibus septem, minute striatis ; apertura sub-circulari, 

 intus lamellis dentiformibus duobus instructa ; labro sim- 

 plici, acuto ; basi glabra ; umbilico lato, profundo. 



SYNONYMS AND REFERENCES. 



Helix lasmodon, PHILLIPS, Journ. Acad. Nat. Sc. VIII. 182, anno 1842. 



DESCRIPTION. 



Animal not noticed. 



