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. 



ft Pillar with an oblique fold. 



LiMN.v.rs. Shell ovate or subturreted, 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. 

 PHYSA. Shell ovate ; inner lip rather expanded. p. 224. 

 AFLEXUS. Shell turreted ; inner lip not expanded. p. 228. 



f-f Pillar-lip with an oblique fold. 

 LIMNJLUS 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. 



VAXVATA. 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. 



