XVI INTRODUCTIO. 



donta, Helicigo7ia, Helicella et Helicostyla genus a me adoptaluin 

 efformant. 



In genere depurato Lamarckiano (IS^^.) Helicella aulea 

 (1812.) ab auctore separata iterum injungitur et bene segregatur 

 Anostoma, male autem duce Schumacher CarocoUa. 



Alii auctores vario modo hoc genus in multa genera vel 

 subgenera diviserunt, ex quibus huc referenda mihi videntur: 

 Pleurodonta Fischer 1807 — Caprinus, Caracolus , Cepolum, Polij- 

 dontes, Iberus, Acaims , Zonites Montf. 1810 ■ — Carocolla, Dentel- 

 laria, Otala Schumacher 1817 — Polygyra Say 1817 — Mesom- 

 phix, Odotropis et Chimotrema Uafinesque 1819 — Arianta, 

 Chilotrema, Pomatia, Tachea, Teba, Zurama LeQch 1820 — Heli- 

 cogena, Cantareus, Helicodonta, Helicigona, Hygromia, Helicella, 

 Theba et Vallonia (?) Risso 1826 — Solarium Spix 1827 — Ste- 

 nopus Guild. 1828 — Ariophanta Desmoulins 1829 — Aplodon, 

 Stenostoma, Toxostoma, Mesodon, Omphalina, Triodopsis, Xolo- 

 trema, Odomphium ^iafmesqvie 1831 — Caracolla Broderip 1832 

 — Conulus, Pyramidula, Monacha, Helicella, Latomiis, Isocjnomo- 

 stoma , Trigonostoma , Chilostoma, Gonyodiscus , Discus, Vitrea, 

 Aegopis, Oxychilus, Helicopsis Fitzinger 1833 — Nanina Gray 

 1834 — Drepanostoma Porro 1836 — Acave Krynicki 1836 — 

 Cepaea, Coenatoria, Cingulifera, Corneola, Lenticula, Xerophila, 

 Fruticicola, Trochiscus, Gonostoma, Tragomma, Patula, Polita 

 Ileld 1837 — Helicopsis, Microcystis, Nanina, Ariophanta, Steno- 

 pus, Helicella, Mesomphix, Zonites , Eyryomphala, Sagda, Pitys, 

 Turricula, Theba , Leucochroa , Ochthephila,Bradybaena, Petasia, 

 Daedalochila , Tridopsis, Polygyra, Circinaria, Macrocyclis , Cam- 

 pylaea, Solaropsis, Iberus, Chilotrema, Caracollina, Vortex, Chlo- 

 ritis, Planispira, Obba, Ampelita, Caracolla, Polydontes, Labyrin- 

 thus, Pleurodonta, Dentellaria, Otala, Helicostyla , Acavus, Heli- 

 cogena, Arianta, Galaxias, Pomatia, Pohjmita, Eurycratera, 

 Stylodon, Helicophanta, Geotrochus et Orthostylus (pars) Beck 

 1 837 — Helix, Cryptomphalus, Chilostoma, Trigonostoma, Carocolla, 

 Conulus, Helicella, Delomphalus et Hyalinia Agassiz et Charpentier 

 1837 — Odontostylus Gray 1840? — Obelus, Oxynota, Eupa- 

 rypha, Helicella, Zonites, Lomastoma, Chilostoma, Actinota, De- 

 lomphalus , Aegopis, Oxylopha, Trigonostoma ; Drepanostoma, 

 Isognomostoma , Conulus, Plicaria, Calocochlea, Proteusia, Tachea, 

 Helicogena, Arianta, Monacha, Trichia, Teba, Ilyalinia, Chromo- 

 cochleu, Columplica, Eulota, Gallina, Heterostoma Hartm. 1840 — 

 44 — Leiostoma, Lucerna, Caracolla, Discodoma , Lucidula, Lu- 

 cernella, Polydontes , Lyrostoma, Polygyra, Lucidella, Pusiodon, 

 Thelidomus, Helix, Hemicycla, Zonites, Epistyla, Ilemitrochus, 

 Geotrochus, Geomitra, Helicella Swains. 1840. (De omnibus hisce 

 nominibus conf. Agass. Nomencl. et Herrmannsen ind., nec 

 non ind. alphabeticus generum et subgenerum in fine vol. II.) 



