CONCHOLOGY. 97 



Shell. Somewhat extraordinary in its formation, orbicular, 

 the spire convex and obtuse, aperture round, dentated grinning, 

 turned upwards to the side of the spire, margin of the lip reflected. 

 J^akes in America. Three species. 



Anostoma dentata.* Anostoma depressa.* 



A. globosa.* 



h. Genus HeUcina. PI. X. 

 s^nimal. See Helix. 



Shell. Terrestrial, distinguished only from the HeUx by its 

 columella being transverse callous ; much depressed and dimin- 

 ished in thickness at the lower part, subliglobular, imperforate ; 

 aperture entire, demioval, margin acute, forming an angle at the 

 lower base of the right lip ; operculum corneous. Inhabits groves 

 in Europe. Nineteen species. 



Helicina neritella. Hehcina rhodostoma. 



H. striata. H. major. 



H. fasciata. H. minima. 



H. viiida. H. submarginata. 



H. pulchella. H. unifasciata. 



H. substriata. H. Brownii. 



H. Braziliensis. H. depressa. 



H. costata. H. aureola. 



H. aurantia. H. orbiculata. 



H. TankervilUi. 



6. Genus Pupa. PI. X. 

 Animal. See Helix. 



Shell. Cylindrical, generally thick ; aperture irregular, semi- 

 ovate, rounded, and subangulated beneath ; margins of outer lip 

 nearly equal and reflected outwardly, unconnected at their upper 

 parts ; the plait of the columella interposed between them. In- 

 habits moss generally in Europe. Thirty-three species. 

 Pupa numia. Pupa quadridens. 



P. uva. P. polyodon. 



P. sulcata. P. variabilis. 



P. Candida. P. frumentum. 



10 



