— 518 — 



.Ilelix Miiller. einend. contin. 



Menke 1828. Syn. p. 8. et simililer 1830. Ibid. ed. 

 2a p. 14. — in Heliceis tetraceris. Subdivi- 

 siones : 



A. Heb'cogena Fer. 



a) columella solida flexa : Columellatae Fer. (Hel. 

 aperta Born etc.) 



b) testa perforata: Perforatae Fer. (Hel. poma- 

 tia Linn.) 



c) testa umbihcata, umbilico obtecto: Acavae 

 Fer. (Hel. aspersa Mull.) 



B. Helicodonta Fer. 



C. Helicella Fer. 



a) labro reflexo: Lomastomae Fer. (Hel. coe- 

 rulans iMiihlf. etc.) 



b) labro simplici: Aplostomae Fer. (Hel. rotun- 

 data MuII.) 



c) labro intus marginato. (Hel. incarnata Miill.) 

 Desu. 1830. Enc. meth. III. p. 206. — genus Heli- 



ceorum. Arlificialis pro|)onitur dispositio specie- 



rum in planorbicas, globulosas, carinatas et tro- 



chiformes. 

 Valenc. 1833. Humb. voy. Zool. IL p. 239. 

 Gray 1834. Proc. Zool. Soc. p. 58. * — Naninas 



segregat. 

 RossMASSL. 183.5. Icon. I. p. 53. 

 Beck 1837. Ind. p. 6. — secundum genus Helicidum. 



Sectiones : 



1) tenuilabres. Subgenera: Helicella Lamck., 

 Mesomphix Rafin., Zonites 3Ionlf., Euryomphala 

 Beck, Sagda Beck, Pitys Beck. 



2) intus marginatae: Subgenera: Turricula 

 Beck, Theba Leach, Leucochroa Beck, Ochthe- 

 phila Beck, Bradybaena Beck. 



3 ) p I a n i I a b r e s. Subgenera : Petasia Beck, Dae- 

 (ialoehila Beck, Tridopsis Rafin., Polygyra Say. 



