92 LAND AND FRESH-WATER SHELLS. 



25. Achatina. — Shell cylindrical, smooth, thin, glossy ; mouth 

 oval, with a notch at its base ; outer lip thin and not reflected ; 

 umbilicus absent. 



(a) Shell fusiform, white ; whorls five and a-half to six ; spire 

 attenuated ; suture deep ; mouth lanceolate, sharply angled above, 

 notched deeply at its base. Length y-yths inch. Subterranean ; 

 specimens are often found in river ejectamenta after floods. 

 Local. A. aciciila. 



Family V. — Carychiidse. 



Shell spiral, oblong ; mouth oval, denticulated ; umbilicus very 

 small. Eyes situated at the posterior base of the dorsal tentacles \ 

 lower tentacles rudimentary. 



26. Carychium. 



{a) Shell white, fusiform, oblong ; whorls five to five and a-half, 

 the body-whorl comprising nearly one-half of the shell ; apex 

 acute; mouth ear-shaped with three denticles; umbilical chink 

 oblique. Height ^th inch. Under stones, in decaying leaves, 

 and at the roots of grass. Moderately common. C. minimum. 



Family VL — Cyclostomatidae. 



Shell cylindrical or conical^ operculated ; mouth round or oval ; 

 operculum shelly or horny. 



27. Cyclostoma. — Shell conical; operculum shelly. 



{a) Shell greyish or yellowish-brown streaked and blotched 

 with purplish-brown, coarsely striated ; whorls four and a-half, 

 tumid ; suture deep ; mouth subrotund ; umbiUcus narrow. 

 Length Jiths inch. In hedgerows and on hillsides in calcareous 

 districts. Moderately common. C clegans.^^ 



28. Acme. — Shell cyUndrical ; operculum horny. 



^'^ V, ochroleuca, yellowish, unicolw, bandless ; v. pallida, very pale 

 yellowish, with some spots and demi-effaced bands ; v. albescens, whitish, 

 unicolor. 



