128 UNIVALVES. — HELIX. 



Family 4. — Imperforated, and convex or ventricose. 

 ' Vermiculata — Rough-dotted. Gothica — Doubtful. 

 Cornu-militare — Bugle-horti. Scabra — Rough. 



Family 5. — Umbilicated, and aperture toothed. 

 Punctata — Punctured. Unidentata — One-toothed. 



Family 6. — Imperforated and aperture toothed. 

 Sinuata — Sinuous. Cepa — Onion. 



Lucerna — Lamp. Nux-denticulata — Nut. 



Lychnucus — Top- shaped. Verruca — Wart-lipped. 



Family 7. — Imperforate and convex, with the aperture toothed 

 and turned upwards. 

 Ringens — Grinner. 



Family 8. — Umhilicated and depressed, aperture ear-shaped^ 



distorted, toothed, and sinuated, with a marginated lip. 



Otis — Plaited. 



Division IT. — Shell depressed, and whirl coiled hori- 

 zontally. 



Family 1. — Umhilicated. 

 *Cornea— Horn. *Contorta — Coiled. 



^\m\\\&— Dotted. *A\h3L— White. 



*Spirorbis — Small-concave. *Crystallina — Crystal. 



Polygrata — Many-whirVd. Cornu-arietis — Ram's-horn. 



Cornu-venatorium — Hunter' s-hom. 



Family 2. — Imperforate and keeled. 



*Planorbis — Notch-lipp'd. *Complanata — Flat-rimhilicated. 



* Vortex — Vortex. 



Division III. — Shell with the aperture sub-lunate. 

 Family 1. — Umhilicated and depressed. 

 *Ericetorutn — Heath. *Tenuis — Thin. 



* Strigata — Girdled. Cellaria — Cellar. 



Incisa — Slit-margin'' d. Obvoluta — Small while- lipp'd. 



*Pisana — Pisa. *Zonaria — Zoned. 



*Nitida — Pellucid. Str'mta— Striated. 



