110 CONCHOLOGY. 



H. striata. The striated Helicina. 



Globular, striated, the right edge sharp, but reflected ; the 

 umbilical callosity rather thick, the operculum calcareous 

 and solidified by a marginal roll and a vertical crosspiece. 



5. Pupa. Twenty-seven species. 



These shells are generally very small, some not more 

 than an eighth of an inch in length ; chiefly terrestrial. 



Shell cylindrical, elongated, or sub-globular, ordinarily ven- 

 tricose : summit obtuse ; the turns of the spire numerous, 

 almost equal ; aperture round or oval, with margins almost 

 equal, expanded, reflected ; one or two plaits on the colu- 

 mellar edge, and several teeth, varying in number on the 

 right margin. 



Pupa zebra, 

 unicarinata. 

 maculosa, 

 clavulata. 

 ovularis. 

 Germanica. 

 cinerea. 

 tridens. 

 avena. 

 granum. 

 fragilis. 

 P. dolium. 

 P. umbilicata. 

 P. muscorum. 



P. Lyonetiana. Lyonet's Pupa. PL 18, fig. 5. 



Species cylindrical, obtuse, aperture compressed and dis- 

 torted by the last whorl in its adult state making suddenly a 

 gibbous inflection to the left. 



P. muscorum. The moss Pupa. 



Species very small, oval or more or less spherical, obtuse, 

 light brownish colour; aperture large, with one tooth; volu- 

 tions convex ; outer lip white and reflected. 



