UNIVALVES. HELIX. 

 DIVISION X. SHELL SUB-UMBILICATED, PYRAMIDAL, AND 



SUMMIT OBTUSE. 



Eipistylium-^-Bee-hive. Papilla Nipple. 



DIVISION XI. SHELL VENTRICOSE, PELLUCID, AND APER- 

 TURE OVATE. 



FAMILY 1. Imperforate. 



*Stagnalis Lake. Inflata Inflated. 



Fragilis Brittle. Opaca Opaque. 



*Palustris Marsh. *Tentaculata Dusky. 



*Fossaria Ditch. *Lutea Yellow. 



Albicans White. Sicula Sicilian. 



*Putris Thin-yellowish. *Glutinosa Membranous. 



Peregra -Horny. *Laevigata- Smooth- flesh-colour 



*Limosa Rough. Balthica Baltic. 



Truncatula Truncated. Neritoidea Nerite- shaped. 



FAMILY 2. Umbilicated. 



Repanda Ventricose. *Canalis Channelled. 



*Auricularia Eared. 



DIVISION XII.TURRETED. 



FAMILY 1. Apex truncated. 

 Consolidata Flat-tipp'd. Truncata Flag. 



Decollata Truncated. Calcaria Chalky. 



Contorta-pHcata Coiled-plaits. 



FAMILY 2. Apex acute. 



C uspidata Pointed. Octona Slender. 



Plicaria White-spotted. Columna Column. 



Undulata Waved. Incumbens Tawny-strip' d. 



Vibex Red-marked. * Acuta Double- banded. 



Crenata Crenated. Undata Undulated. 



Fuscata Brown-clouded. Fluviatilis River. 



*Peregrina Eight- whirl' d. Turbinata Turbinated. 



Carinula Brown-lin'd. 



DIVISION XIII. SHELL DEPRESSED, SPIRE FLATTISH, APER- 

 TURE VERY LARGE, EXPOSING THE WHOLE INSIDE. 



Perspicua Large-mouth' d. Haliotoidea Venus' s-ear. 



