112 HELICIDJE. 



Shell conical, globose, thin, scarcely semitransparent, of a 

 dull aspect, brownish horn-colour ; epidermis raised in the line 

 of growth into numerous thin plaits or ridges, which in the 

 centre of the whorls are produced into spinous points, the inter- 

 mediate furrows are microscopically striate transversely ; epi- 

 dermis thick ; whorls 4-45, convex, gradually increasing ; peri- 

 phery faintly keeled ; apex obtuse ; mouth nearly semicircular ; 

 outer lip with an internal white rib, somewhat reflected ; umbi- 

 licus rather small. 



Inhabits woods and hedgerows in moss and under 

 fallen leaves in most parts of Great Britain. Gwyn 

 Jeffreys says he has observed it feeding on Junger- 

 mannia platyphylla (flat-leaved Jungermannia). I do 

 not think, however, that it feeds exclusively upon 

 that plant, for I have found it much more frequently 

 on the fallen leaves of trees, particularly those of the 

 beech and holly. It is less shy than H, lamellata, 

 and like that species carries its shell erect, but its 

 movements are more graceful. 



Var. albida.—S\iQ\\ whitish. Bath (Clark), B.C. 



3. H. poma'tia,* Linn£. Pl. VII. 



Body varying in colour from yellowish-grey to pale brown, 

 thickly covered with large, oval, wart-like excrescences ; mantle 

 with three fleshy lobes j tentacles long, bulbs globular, small ; 

 foot broad, rounded in front, bluntly pointed behind; lingual 

 ribbon with 140 rows of 151 teeth = 21,140. 



Shell globose, solid, almost opaque, dull yellowish-white more 

 or less banded and tinged with brown, with strong, coarse, 

 irregular strise in the line of growth, which are crossed by fine 

 spiral lines; epidennis thickish ; whorls 4-5, much rounded, 

 body whorl occupying about two-thirds of the shell ; spire short, 

 apex obtuse ; suture distinct, but shallow ; mouth roundish. 



* Operculate. 



