HELIX. 83 



H. PYGM.KA, Draparnaiid. 



Resembling the last, but minute, paler, more transparent, more 

 depressed, composed of four turns at most ; the mouth less 

 circular. 



Plate CXXI. fig. !), 10. 

 IIcUj; pygma-a, Drap. Moll. Terr, et Fluv. France, p. 114, pi. 8, f. 8, 9, 10. — 

 Gray, Medical Repository, 1821, p. 239 (not described). — 

 Jeffreys, Trans. Linn. Soc. vol. xvi. p. 343. — Turt. Manual 

 L, and F. W. Shells, p. 61, f. 46.— Brown, Illust. Conch. G. 

 B. p. 51, pi. 18, f. 48*, 49.— Ferus. Prodr. Moll. no. 200; 

 Hist. Moll. Terr, et Fluv. pi. 80, f. 1 (Helicella).— Lam. (ed. 

 Desh.) vol. viii. p. 86. — C. Pfeif. Deutsch. Land und Siissw. 

 MolL pt. 3, p. 21, pi. 4, f. 20, 21. — Charpent. N. Denks. 

 Schweiz. Ges. Nat. vol. i. (1837) p. 12 (Delomphalus). — 

 RossMASSL. Iconog. Land und Siisswas. Moll. pt. 8, p. 37, 

 f. 532.— Morelet, Moll. Ter. et Fluv. Portugal, p. 55. — 

 Chemn. (ed. Kust.) Conch. Cab. Helix, no. 564, pi. 89, f. 24 to 

 27. — L. Pfeif. Monog. Helic. vol. i. p. 97. 

 „ minuta, Studer in Coxe, Travels. 



„ A7r6i7,SHEPPARD,Trans. Linn. Soc. vol. xiv. p. 1 63 (probably). — Jeffreys, 

 Trans. Linn. Soc. vol. xvi. p. 512. 

 Discus pygmceus, Fitzing. Syst. Verz. Erzh. Weichth. p. 99. 

 I'atula pyijmcea. Held, Isis, 1837, p. 916. 



EuryomplMlu pygmaia. Beck, Index Moll. Mus. Christ. Frid. p. 9. 

 Zonitts jiygmiBus^ Gray, Manual L. and F. W. Shells, p. 167, pi. 5, f. 46. — 

 Macgilliv. Moll. Aberd. p. 323. 



Shell very minute, convex, thin, of an uniform pale and 

 hardly transparent brownish horn-colour, with extremely 

 delicate, but regular, longitudinal stria, of a silky gloss ; 

 spire very short and small, the convexity being equal on 

 both sides of the shell ; apex blunt. Whorls three and a 

 half to four, moderately broad, not rapidly increasing, 

 deeply defined, convex. Aperture rather small, roundish, 

 crescent-shaped, about equal in width to two-fifths of the 

 total diameter, almost, if not quite, as high as it is broad. 

 Peristome thin, simple, not reflected. Base much rounded; 

 umbilicus large and profound. 



