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. 
