HELIX §. 36. 105 



§. 36. 



648. H. planella Pfr. 



T. umbilicata, subdiscoidea , tenuissima, ruguioso-striata, 

 pellucida, oleoso-micans, cornea; spira subplana, vertice sub- 

 tili, non prominente; sutura impressa; anfr. 5 vix convexius- 

 culi, sensim accrescentes, ultimus latior, perdepressus, peri- 

 pheria obsolete angulalus, antice non descendens, basi planius- 

 culus; umbilicus conicus, Vs diametri subaequans; apertura 

 diagonalis, depresse rotundato-lunaris ; perist. simplex, rectum, 

 marginibus vix convergentibus , columellari declivi, levissime 

 arcuato. — Diam. maj. 10, min. 8, alt. 3^3 niill. (Coll. Rossm. 

 nomine //. complanatae.) 



Helix planella Pfr. in Zeitschr. f. Malak. 1853. p. 146. 

 — • — (Hyalina) Pfr. Vers. p. 12 4. 



Habitat in Sicilia. 



649. Juloidea Forb. [Rv. n. 1464. t. 207. — Discus 



Pfr. Vers. p. 123.) Mon.III. p. 106. 



650. H. bombycina Pfr. 



T. umbilicata, depressa, discoidea, tenuis, costulis con- 

 ferlis subarcuatis, subtus minoribus sculpta, sericea, fulva, 

 fasciis permultis castaneis ornata; spira subplana; sutura im- 

 pressa; anfr. 4 celeriter accrescentes, vix convexiusculi, ulti- 

 mus depressus, antice non descendens, basi paruin convexus; 

 umbilicus perspectivus, Y^ diametri subaequans; apertura dia- 

 gonalis, lunato-circularis; perist. simplex, rectum, marginibus 

 approximatis, dextro antrorsum pcrdilatato, basali perarcuato, 

 ad umbilicum vix dilatato. — Diam. maj. Hy^, min. W^/.i-, alt. 

 6 mill. (Mus. Cuming.) 



Helix hombycina Pfr. in Proc. Zool. Soc. 1834. p. 54. 



— — Reeve Conch. ic. n. 1314. t. 188. 



— — (Discus) Pfr. Vers. p. 123. 



Habitat Yandiemensland. 



651. dissimilis Orb. (Coll. 273. — Rv. n. 629. t. in. 

 — Gay Hist. VIII. p. 96. — Discus Pfr. Vers. 

 p. 125. — H. histrio Mlf. — Discus dissimilis Ad. 

 Gen. p. 117.) Mon. III. p. 108. 



652. H. Gratioletti Hupe. f 



«H. testa orbiculata, depresso-rotundata, lenui, rugosa 

 maculis undulatis fusco-rubris ornata; umbilico lato; apertura 



