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 T 2 T ths inch. Subterranean ; 

 specimens are often found in river ejectamenta after floods. 

 Local. A. acicula. 



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 Jth inch. Under stones, in decaying leaves, 

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



Family VI. C>clostomatidae. 



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 ; umbilicus narrow. 

 Length -|fths inch. In hedgerows and on hillsides in calcareous 

 districts. Moderately common. C. elegans?* 



28. Acme. Shell cylindrical; operculum horny. 



93 v. ochroleuca, yellowish, unicolor, bandless ; v. pallida, very pale 

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

 unicolor. 



