160 SPECIFIC 



the apex ; very finely striate longitudinally, very 

 thin and brittle; body turgid ; 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 ; columellar lip gibbous, of two colours. 



Lister Conch. Tab. 568. Fig. 19. 



Specimen yellowish brown, with cinereous 

 clouds ; upper part of the whorls marked with short 

 oblique reddish brown streaks ; cinereous towards 

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

 part of the aperture white, remainder ferruginous ; 

 umbilicus chesnut. 



Inhabits Tranquebar and Barbary. 



Fig. 7. N. littoralis. 



Shell smooth ; apex carious. 



Lister Conch. Tab. 607. Fig. 39, 40. 



Specimen yellow ; very much resembling a Turbo 

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

 every other respect. 



Inhabits the rocky shores of Europe. 



