i88 CYCLOSTOMATIDM. 



thin, flexuous, reflected over the umbiHcus ; inner lip thinly 

 spread on the base of the penultimate whorl ; umbilicus small, 

 nearly hidden by the reflexion of the outer lip ; operculum flat, 

 with very slight irregular striae. 



Inhabits damp places in woods, among moss, lichens, 

 and dead leaves, and in decayed timber, as well as 

 under stones in dry ditches and drains, from the south- 

 west of Scotland to Land's End, and in Wales and 

 Ireland, but it is by no means common. 



This little mollusc is rather active ; when crawling 

 it carries its shell in an almost perpendicular position, 

 twisting it round and occasionally allowing it to drop 

 down suddenly. It secretes an abundance of watery 

 slime. 



In some specimens the shell is nearly devoid of 

 striation. 



Van alba. — Shell white or colourless, and transparent. 

 Rejectamenta of the River Avon at Bristol ; Ballinahinch, Co. 

 Galway (J. G. J.) ; Killarney (Barlee), B.C. 



Monst. simstrorsa, spire reversed. A single specimen among 

 the refuse of the Avon at Bristol (J. G. J.), B.C. 



