HELIX. 123 



parent, and greyish at their base, upper pair very slender, 

 covered with small tubercles, lower pair diverging at their base, 

 rather thick ; bulbs small ; foot roundish in front ; tapering 

 gradually towards the tail. 



Shell subconic, considerably depressed above, slightly rounded 

 underneath, thicker, less transparent and glossy than the last 

 species, of a greyish or yellowish white colour faintly tinged 

 with pale brown, with a milk-white spiral band placed slightly 

 above the periphery, irregularly striate in the line of growth and 

 very faintly so in a spiral direction, especially near the um- 

 bilicus ; body whorl closely but indistinctly pitted ; epidermis 

 thinnish ; whorls 6-7, body whorl occupying about half of the 

 shell ; periphery faintly keeled ; spire depressed, apex slightly 

 acute ; suture deepish ; mouth forming about two-thirds of an 

 oval, with a broadish white internal rib ; outer lip thin, scarcely 

 reflected, except over the umbilicus ; umbilicus very small, 

 nearly hidden by the reflection of the outer lip. 



Inhabits the downs of Kent and Sussex, near the 

 sea-coast abundantly, on grass and other plants. It 

 is a sluggish and irritable creature, but rather hardy, 

 and it does not seem to be inconvenienced by the heat 

 of the sun ; its shell is carried in a slanting position 

 when the animal is in motion. The shell is much 

 smaller than that of the last species, more solid, less 

 transparent, and the umbilicus is considerably smaller. 



Var. rujilabris, Jeffr. Shell smaller, with inside rib of a red- 

 dish brown colour. Lewes and Littlehampton, B.C. 



9. H. RUFES'CENS,* PENNANT. PL. VIII. 



Body of a dusky ash-colour, or brown, occasionally blackish, 

 tubercles prominent; tentacles greyish ash-colour, upper pair 

 long and slender ; lower pair very short ; foot narrow, of a pale 

 ash-colour beneath. 



Shell subconic, depressed above, somewhat convex beneath, 



Reddish, 



