HELIX. 223 



relle des MoUusques terrestres et fluviatiles de la France' 

 was edited by his widow and appeared in 1805. Studer 

 first gave this species the name of " rupestris^^ in Coxe^s 

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

 scribe it. 



21. H. pygmte'a^, Draparnaud. 



H. pygmaa, Drap. Tabl. p. 93, and Hist. p. 114, pi. viii. f. 8-10 ; F. & H. 

 iv."^ p. 83, pi. cxxi. 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: tentades 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 striae and spirally (especially round the 

 umbihcus) with a few dehcate lines, which are only percei)tible 

 with a high magnifier: periphery rounded and not keeled: 

 epidermis rather thin : ivIlovIs 4, convex and cyhndrical, 

 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 fully 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- 



* Tinv. 



