1 60 SPECIFIC 



the apex ; very finely striate longitudinally, very 

 thin and brittle ; body turgi J ; spire small ; aper- 

 ture wide ; outer lip not margined. 



Inhabits the stagnant waters of Europe. 



Fig. 6. Nerita glaucina. 



Shell smooth ; spire rather obtuse ; umbilicus 

 half-closed ; cohnncllar lip gibbous, of two colours. 



Lisle?- Conch, tab. 5GS. fig. 19. 



Specimen yellowish brown, with cinereous 

 clouds ; upper part of the whorls marked with short 

 cl)li(iue reddish brown streaks ', cinereous towards 

 the apex ; front of the columella, lip, and lower 

 part of the aperture white, remainder ferruginous^ 

 umbilicus chesnut. 



Inhabits Tran(iuebar and Barbary. 



Fig. 7. N. littoralis. 



Shell smooth ; apex carious. 



Lister Conch, tab. ()()7. fig. 39, -JO. 



Specimen yellow; very much resembling aTurbo 

 in the form of the aperture, but a perfect Nerita in 

 every other rcsj)ect. 



Inhabits the rocky shores of Europe. 



