INTRODUCTIO. XY 



vivendi ralione t'l struclura a Cuniing cl Troschel niihi corn- 

 municatis, ad Bulimos eas restitui, quamvis ex sentenlia Ci. Tro- 

 schel (Zeitschr. f. Malak. 1847. p. 50.) senus Orthaliois Beck pro 

 illis adoptandum sif. 



IV. Helis: Linn. (cmend. Drap. ct Lam.) 



Tesla umbilicata , perforata vei imperforata, discoidea, glo- 

 boso-depressa vel conoidca; apertura transversa, obliqua, lunaris 

 vel subrolundala, marginibus distinctis, remotis vel callo junctis. 

 (Spec. vid. vol. I. p. IG.) 



Helix Linn. emend. Miill., Scoj)., Drap. etc 



— MilU. verm. II. p. 12. 



— Drap. hist. p. 2 3. 29. 78. 



— Lam. hist. YI. 2. p. 62. ed. Desh. VIII. p. 2 2. et Carocolla 



Lam. YJ. 2. p. 94. ed. Desh. VIII. p. 142. 



— C. Pfr. Nal. I. p. 12. 



— Blainv. In Dict. d. sc. nat. vol. 32. p. 2o2. 



— Desh. in Encycl. melh. II. p. 188. 



— Nanina, Stenopns Beck ind. 



— et Carocolla Beeve Conch. syst. II. p. 67. 71. 



— — — Catlow Conch. Nom. p. H8. 138. 



— Kiister et L. Pfr. in Chemn. ed. II. vol. I. Sect. 12. 

 Helices Held in Isis 1837. p. 905. 



(Reliqua synon. vid. infra et in Herrmannsen Ind. gen. : Helix, 



Nanina etc.) 

 Animal familiae typicum. 



Genus tum numero specierum, tum variabililate formarum 

 excellens, in omnia genera affinia fere absque limitibus irradians, 

 in §. 47 a Bulimorum §, I el §. 12 speciebus nonnullis omnino 

 non distinguendum, altero latere transitus immediatos in Daude- 

 bardiam et Yitrinam offerens. 



Genus Helicis uli piimum a Linnaeo constitutum est, diver- 

 sissimas complectitur testas, hodieHelici, Polydontae, Planorbi, 

 Anostomati, Ampullariae, Janlhinae, Paludinae, Bulimo, Meia- 

 niae, Limnaeae, Succineae, Clausiliae, Coriocellae, Sigarelo et 

 Fossaro adscriptas. — In emendato genere MUlleriano emissis 

 Planorbe , Vertigine , Carychio et Buccino praeter Ilelices veras 

 species adhuc restant Yitrinae, Anostomatis, Lanistae, Cyclosto- 

 matis, Bulimi, Polydontae, Succineae, Achatinae, Pupae, Auri- 

 culae, Clausiliae, Pyramidellae. -— Scopoli primus 1786 Buii- 

 mum segregavit, tum Lamarck 1799 Helicinam et Sigaretum el 

 1801 Janthinam, Draparnaud 1801 Yitrinam et Succineam et 

 1805 Ciausiliam, deinde Fischer 1807 Polydontam el Anostoma. 



In genere //e/jce Fer. ( 1819) subget^era Helicogena, Helico- 



