io8 HELICID&. 



B. Shell conical, umHlicus indistinct. 

 10. Z. FUL'VUS,* MULLER. PL. VII. 



Body long and slender, nearly opaque, of a dark slaty-grey 

 or reddish-brown colour, fiaely spotted with black; tentacles 

 very long, slaty-black, uppa pair diverging considerably, bulbs 

 globular ; foot rounded in iront, keeled, and ending in a point 

 behind ; lingual ribbon with 70 rows of 45 teeth = 3150. 



Shell conical, thin, glossy, especially underneath, semitrans- 

 parent, of a tawny colour, with numerous very fine, irregular, 

 transverse striae, which are crossed by exceedingly delicate 

 spiral lines visible only under a powerful lens, though they are 

 slightly stronger below the periphery ; epidermis very thin ; 

 whorls 5 1-6, gradually enlarging ; periphery bluntly but dis- 

 tinctly keeled ; spire produced, apex obtuse ; suture well de- 

 fined ; mouth semilunar, narrow ; outer lip reflected on the pillar ; 

 umbilicus minute, in immature specimens a mere depression. 



Inhabits woods and other shady places in damp 

 situations, among dead leaves, under fallen branches 

 of trees and stones, in most parts of Great Britain. 

 Though rather inactive, this little mollusc does not 

 often retire within its shell unless disturbed. It 

 secretes an abundance of slime. 



In adult specimens the epidermis, especially on the 

 upper whorls, is frequently eroded. The shell varies 

 considerably in size and colour according to the 

 nature of its habitat. 



It forms a connecting link between the genus to 

 which it belongs and that of Helix. 



Var. Mortoni. Shell of a paler colour, with the spire more 

 depressed and the peripheral keel sharper. Helix Mortoni, Jeffr. 

 in ' Linn. Trans.,' vol. xvi. p. 332. Somerset and North Hants, 

 B.C. Heaton Dean near Newcastle (W. D. Sutton), J.C. 



* Tawny. 



