HELIX §. 20. 51 



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

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



Helix Tlnvuitesi Pfr. in l'roc. Zool. Soc. 1853. p. 125. 



— — liecvc Conch. ic. n. 1336. t. 191. 



— — (jMicrocystis) Pfr. Vors. p. 123. 



Habitat in insula Ceylon (Thwaites). 



292. indentata Say. (Coll. 1 15. — Binn. Terr. Moll. II. 

 p. -24-2. t. 29. f. 2. — Ri\ n. 730. t. 122. — Hyalina 

 Pfr. Yors. p. 123. — HeliccUa unidenlata Ad. Gen. 

 p. 119.) ^lon. III. p. Gd, 



293 H. infans Pfr, 



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

 nilida, albida; spira brevissime conoidea; sutura impressa, 

 dislincte marginata; anfr. 5 convexiusculi , sensim accrescentes, 

 ullimus non descendens, convexior; apertura obliqua, irregu- 

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

 ginibus remotis, columellari declivi, suporne subincrassato. — 

 Diam. maj. 0^3, min. o, alt. 3 mill. (Mus. Cuming.) 



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



— — Beeve Gonch. ic. n. 1417. t. 201. 



— — (Microcystis) Pfr. Vers. p. 123. 



Habitat Bornoo, 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 verticalis, late lunaris; perist. simplex, rectum, mar- 

 ginibus subconvergentibus , dextro fortiter, basali leviter ar- 

 cuato. — Diam. maj, 5, min. 4^2, alt. Sy^ 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. 12 3. 



Habitat Santa Ana Novae Granadae. 



295. hydatina Rossm. (Coll. 116. — Rv. n. 1144. 

 t. 170. — Roth Spicil. p. 6. — Hyalina Pfr. Vors. 

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

 tina Ad. Gen. p. 1 1 8. — Zonites crystalUnus p Moq. 

 Moll. Fr. p. 89. — Zonites hydalinus Boury. Amen. 

 malac. I. p. 188. t. 20. f. 4—6.) Mon. III. p. 65. 



4* 



