128 UNIVALVES. HELIX. 



FAMILY 4. Imperforated, and convex or ventricose. 

 Vermiculata Rough- dotted. Gothica Doubtful. 

 Cornu-militare Bugle-horn. 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. Umbilicated and depressed, aperture ear-shaped, 



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



Otis Plaited. 



DIVISION II. SHELL DEPRESSED, AND WHIRL COILED HORI- 

 ZONTALLY. 



FAMILY 1. Umbilicated. 



*Cornea Horn. *Contorta Coiled. 



Similis Dotted. *Alba White. 



*Spirorbis Small-concave. *Crystallina Crystal. 



Polygrata Many-whirl' d. Cornu-arietis Ram's-horn. 



Cornu-venatorium Hunter' s-horn. 



FAMILY 2. Imperforate and keeled. 



*Planorbis Notch-lipp'd. *Complanata Flat-umbilicated. 

 * Vortex Vortex. 



DIVISION III. SHELL WITH THE APERTURE SUB-LUNATE. 



FAMILY 1. Umbilicated and depressed. 

 *Ericetorum Heath. *Tenuis Thin. 



*Strigata Girdled. Cellaria Cellar. 



Incisa Slit-margin 1 d. Obvoluta Small while-lipped. 



*Pisana Pisa. *Zonaria Zoned. 



*Nitida Pellucid. Striata Striated. 



