( 46 ) (Hdix, Fer.) 



5. Helicostyla. Fer. 



Elliptical or trochiform. Columella solid. 



a Aplostomae. Columella straight ; peristoma simple PI. 8, fig. 6. 



b Lamellatae. Columella straight, round; perisloma simple; an internal 

 plate on the last whorl. PI. 8, fig. 9, 10. 



c Canaliculate. Columella twisted, as if truncated at the base, or with an 

 internal spiral rib forming a gutter, under the form of a tooth or cal- 

 losity. PI. 13, fig. 1. 



d Marginata. Columella flattened, without teeth or plates; peristoma 

 reflected. PI. 8, fig. 11. 



6. Helicophanta. Fer. 



Spire depressed ; volu- Perforated or umbili- 

 tions rapidly increasing cate. 

 horizontally ; mouth very 

 large and oblique ; only 

 three to three and a half 

 whorls ; the last enormous. 



a Vitrinoides. Peristoma simple. PI. 7, fig. % 



b Vesiculae. Peristoma thickened and sub-reflected. PI. 7, fig. 3, 4. 



B. Longitudinally volute. 



7. Cochloiiydra. Fer. 

 Amphibulima. Lam. Suc- 

 cinea. Drap. 



Elongated, oval ; volu- Peristoma simple, 

 tions rapidly increasing 

 vertically ; spire short , 

 with 2 to 4 whorls, the 

 last forming almost the 

 whole of the shell ; mouth 

 very large. PI. 6, fig. 5. 

 PL 7, %. 5, 6. 



8. Cochlostyla. Fer. 



Elongated or ventricose ; Columella solid, not 

 spire elevated : whorls in- truncated at the base, 

 creasing rapidly. 



a Lomastomae. Peristoma reflected. PI. 8, fig. 27. 



b Aplostomae. (1) Peristoma simple. 



9. Cochlitoma. Fer. 

 Achat ina. Lam. 



Conical or very ventri- Columella solid, flat, 

 cose , solid, little transpa- and truncatedat the base, 

 rent. 



a Liguus, Montf. Base conical ; mouth short ; outer lip advanced. PI. 8, 

 fig. 26. 



b Achatina, Montf. Ventrical; mouth very large; outer lip vertical. PI. 

 13, fig. 3. 



(i) The Sultana (Helix Gallina Sultana^ Chem.) was sold, at the sale of the 

 Count de Latour d'Auvergne, for 5G0 francs. 



