COLIMACEA. 79 



Variety 2, pi. XVII, f. 14 and 20. Pale, nearly colourless, 

 semitransparent, and destitute of rays. 



Shell with the spire depressed, consisting of five rather flat- 

 tened, but well defined volutions ; body rounded, with a sub- 

 carinated zone round its centre; base convex, with a very large 

 and deep umbilicus, exhibiting all the superior volutions inter- 

 nally; aperture semilunar; outer lip thin, and not reflected; 

 whole surface of a light brown colour, and diagonally rayed 

 with chestnut ; and with strong, longitudinally obhque, regular, 

 close-set striae. Diameter a little more than a quarter of an 

 inch. 



This shell is found all over Great Britain and Ireland, on old 

 walls, dry mud banks, and under stones in woody situations. 



Mr. Thompson mentions having found a specimen at Shane's 

 Castle Park, County of Antrim, whose height and diameter 

 were equal, and procured two of the crystalline variety at 

 Holywood House, County of Down. 



39. Helix pygm^a, pi. VIII, f. 25, 26. 



Helix pygmcea, Drapernaud, p. 114, pi. 8, f. 8, 9, 10, No. 

 51; Ferussac, Prod., No. 200; Gray, Med. Rep., 1821, p. 239;' 

 Turton, Man., p. 61, f. 46, No. 46 ; Pfeiffer, III, p. 21, pi. 4' 

 f. 20, 21 ; Nilsson, Sacc, p. 32; Jeffreys, Linn. Tr., XVI, p'. 

 343 ; Rossmassler, VIII, p. 37, pi. 39, f. 532 ; Alder, Mag 

 Zool.and Bot., II, p. 109; Thompson, Ann. and Mag. Nat. 

 Hist., VI, p. 31 ; Brown, Illust. Conch., p. 51, pi, 18, f. 48, 49; 

 Helix Kirhii, Sheppard, Linn. Trans, XVI, p. 162; Jeffreys' 

 Linn. Tr., XIII, p. 512. 



Shell subdiaphanous, with the body large ; spire very small, 

 consisting of three rapidly, well defined, diminishing volutions' 

 terminating in a subobtuse apex ; aperture roundish, subluni- 

 form, width and length equal; outer lip thin, but not reflected; 

 of a horn-colour, with very slight longitudinal striae ; umbiHcus 

 rather large ; base rounded. Diameter about the fifteenth of 

 an inch. 



A local species in Britain, inhabiting shaded and moist locali- 

 ties, lurking under stones and fallen leaves, and has been met 

 with near Clare, in Suffolk ; at Devizes, Wiltshire ; and near 

 Wylam and at Twizil House, Northumberland. We found it 

 in Rosslyn Glen, County of Mid Lothian, and Thompson says 



