HELIX §. 20. 51 



descendente, ad perforalionem vix dilatato. — Diam. maj. 5, 

 min. iVa, alt. 3 mill. (Mus. Cuming.) 



Helix Thwaitesi Pfr. in Proc. Zool. Soc 1853. p. 12"). 



— — Reeve Conch. ic. n. 1336. l. 191. 



— — (Microcystis) Pfr. Vers. p. 123. 



Habitat in insula Ceylon (Thwaites). 



292. indentata Say. (Goll. 115. — Binn. Terr. Moll. II. 

 p. -242. t. 29. f. 2. — Rv. n. 730. t. 122. — Hyalina 

 Pfr. Yers. p. 123. — Helicdla unidentata Ad. Gen. 

 p. -119.) Mon.lII. p. 65. 



203 H. infans Pfr. 



T, subperforata , conoideo-depressa , solidula , laevigata, 

 nitida, albida; spira brevissime conoidea; sutura impressa, 

 distincte marginata; anfr. 5 convexiusculi , sensim accrescentes, 

 ultimus non descendens, convexior; apertura obliqua, irregu- 

 lariter lunaris; perist. simplex, reclum, rufulo-limbatum, mar- 

 ginibus remotis, columellari declivi, superne subincrassato. — 

 Diam. maj. 5^3, min. 5, alt. 3 mill. (Mus. Cuming.) 



Helix infans Pfr. in Proc. Zool. Soc. 1854. p. 290. 



— — Reeve Concli. ic. n. 1417. t. 201. 



— — (Microcystis) Pfr. Vers. p. 123. 



Ilabitat Borneo, Sarawak. 



294. H. mediocris Pfr. 



T. vix subperforata , depressa, discoidea, tenuis, laevigata, 

 albido-hyalina; spira subplana; sutura impressa, submarginata ; 

 anfr. 4 vix convexiusculi, sensim accrescentes, ultimus antice 

 subdilatatus , non descendens, rotundatus, basi subexcavatus ; 

 apertura verticaHs, late lunaris; perist. simplex, rectum, mar- 

 ginibus subconvergentibus , dextro fortiter, basali leviter ar- 

 cuato. — Diam. maj. 5, min. 4^2, alt. 27^ mill. (Mus. Cuming.) 

 Helix mediocris Pfr. in Proc. Zool. Soc. 18 54. p. 51. 



— ~ Reeve Conch. ic. n. 1337. t. 191. 



— — (Microcystis) Pfr. Vers. p. 123. 



Habitat Santa Ana Novae Granadae. 



295. hydatina Rossm. (Coll. U6. — Bv. n. -1144. 

 t. 170. — Both Spicil. p. 6. — Hyalina Pfr. Vers. 

 p. 123. — H. diapJiana Mlf. — Helicella hyda- 

 tina Ad. Gen. p. 118. — Zonites crystallinns p Moq. 

 Moll. Fr. p. 89. — Zonites hydatinu.f Bourg. Am6n. 



malac. I. p. 188. t. 20. f. 4—6.) Mon, 111. p. 63. 



4* 



