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. 
ff Pillar with an oblique fold. 
Limn^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. 
Physa. Shell ovate ; inner lip rather expanded. — p. 224, 
Aplexus. Shell turreted; inner lip not expanded. — p. 228. 
II Pillar-lip with an oblique fold. 
Limnjeus 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. 
Yalvata. 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. 
