HELIX. 223 



relle des Mollusques terrestres et fluviatiles de la France' 

 was edited by his widow and appeared in 1805. Studer 

 first gave this species the name of '' rifpestris'^ in Coxe^s 

 ^Travels through Switzerland^ (1789), but did not de- 

 scribe it. 



21. H. pygm^'a"^, Drapamaud. 



H. 2m^i(sa, Drap. Tabl. p. 93, aud Hist. p. 114, pi. viii. f. 8-10 ; F. & H. 

 iv. p. 83, pi. csxi. f. 9, 10. 



Body greyish-brown or slate-colour, minutely speckled with 

 black ; tubercles round and much depressed : mantle brown, 

 with a slight tinge of red: tentacles rather close together, 

 nearly cylindrical, abruptly thickened at their base ; bulbs 

 indistinct : foot narrow and ending in a thick and keeled tail. 



Shell nearly circular, depressed above and below, thin, 

 semitransparent, rather glossy and having a silky lustre, light- 

 brown or tawny, marked transversely with extremely fine 

 and close-set curved strias and spirally (especially round the 

 umbihcus) with a few delicate lines, which are only perceptible 

 with a high magnifier : periphery rounded and not keeled : 

 ejndermis rather thin : ivhorls 4, convex and cylindrical, 

 gradually increasing in size : spire not much raised ; summit 

 glossy and transparent : suture deep : mouth shaped as in 

 H. rupestris and not margined : outer lip thin, somewhat in- 

 flected on both sides : umbilicus moderately large, but deep 

 and fuUy exposing the interior of the spire, as well as part of 

 the penultimate whorl. L. 0-03. B. 0-06. 



Habitat : Woods and moist places under stones and 

 among dead leaves, as well as at the roots of grass and 

 rushes^ from Oban to Guernsey. It is widely diffused^ 

 although difficult to find on account of its minute size. 

 Saint- Simon seems to have been successful in taking it 

 several times and in considerable numbers by sweeping 

 the wet grass and herbage after rain with an entomolo- 

 gists' gauze net ; and Dr. Turton told me that he pro- 



* Tiny, 



