PLATE CLXVIIL 



FIG. I. 

 HELIX PUTRIS. 



MUD SNAIL. 

 GENERIC CHARACTER. 



Aperture of the mouth contracted and lunulated, 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell imperforate, obtuse, ovate, yellow: aperture ovate. 



Helix Putris : testa imperforata, ovata obtusa flava: apertura, 

 ovata. Linn. Fn. Suec. 2189. 

 Gualt. t. 5. /. H. 

 Chem. Conch. 9. t. 135. /. 1248. 

 List. Conch, t. 123. /. 23 ? 



c2 



