284 TABLE OF GENERA. 



** Mouth longitudinal, dextral. 



f Pillar-lip smooth, not folded. 



SucciNEA. Shell oval, amber-coloured ; mouth large ; front 

 entire, rounded. — p. 147. 



BuLiMUS (acutus). Shell turreted, white, variegated ; mouth 

 moderate ; front entire, rounded. — p. 149. 



AcHATiNA. Shell turreted, white ; mouth moderate ; front 

 truncated. — p. 158. 



fl Pillar icith an oblique fold. 



LiMK^us. Shell ovate or sub turreted, perforated; inner lip 

 not expanded. — p. 199. 



Amphipeplea. Shell ovate, very thin, imperforated ; inner lip 

 rather expanded. — p. 212. 



*** Mouth longitudinal, sinistral. 

 f Pillar-lip smooth; shell very thin, imperforated. 

 Phtsa. Shell ovate ; inner lip rather expanded. — p. 224, 

 Afi-exus. Shell turreted ; inner lip not expanded. — p. 228. 



^'^ Pillar-lip ivith an oblique fold. 

 LiMN^us pereger lineatus. A monstrosity. — p. 199. 



b. Shell moderately thick ; peristome not thickened, continued. 

 * Shell grooved, variegated, ovate ; mouth suborbicular. 

 Cyclostoma. — p. 18. 



** Shell smooth, olive ; mouth ovate or orbicular. 



Valvata. Shell conical or depressed, umbilicated ; mouth or- 

 bicular. — p. 34. 



Paludina. Shell ovate, conical, perforated, olive, banded ; 

 mouth ovate. — p. 29. 



BiTHiNiA. Shell ovate, conical, perforated, transparent ; mouth 

 ovate. — p. 25. 



AssiMiNiA. Shell ovate, conical, solid, brown ; mouth ovate. — 

 p.21. 



