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 Impevforata, ovata obtusa flava: apertura, 

 ovata. Linn. Fn. Suec. 2189. 

 Gualt. t. 5. f. H. 

 Chem. Conch. 9. t. US. f. 1248. 

 List. Conch, t. 123. / 23 ? 



c 2 



