118 THE ELEMENTS 



Fig:. 13th.— TURBO LABIATUS. 



Shell with nine reversed volutions or 

 whorls, tapering to a fine point; co- 

 lour light brown, with strong, regular, 

 lonofitudinal striae ; volutions flat, and 

 separated by a fine obsolete line ; 

 qperture sub-orbicular and white, with 

 a sinus at the upper end, with two 

 teeth-like laminae on the inner lip ; 

 margin reflected, broad and thick. 

 Found in Hyde Park, and the ozier 

 grounds at Battersea in Surrey. 



Linn. Trans, vol. viii. page 180. 



b Heversed or heterostrophe spire, 

 a teeth of a univalve. 



FiorUth. -HELIX PLANORBIS, 

 SJiell depressed and sub-pellucid, 

 horn-coloured, rufous, or light chesnut 

 brown ; generally with a light umber- 

 coloured epidermis ; volutions ^se, 

 placed laterally on each other, gradu- 

 ally decreasing to the centre, making 

 the shell concave at top, rounded and 

 defined by the suture ; subulated 



