UNIVALVES HELIX. 



119 



*Putris — Yellowish. 



Acu ta — Pointed. 



Papilla — Nipple. 



Minuta — Minute. 



Detrita — Smooth-rayed. 



Ventricosa — Veyitricose. 

 *Obscura — Small brown. 

 *Lubrica — Glossy. 

 Limosa — Rough. 

 Contortuplicata — Coil-plaited. 

 Angularis — Angular. 

 *Tentaculata — Olive. 

 *Auricularia — Eared. 

 *Laevigata — Smooth. 

 Balthica — Baltic. 

 Neritoidea — Nerite-shaped. 

 Perspicua — Large-mouth. 

 Haliotoidea — Venus' s Ear. 

 Muralis — Wall. 

 Vertigo — Round. 

 Carichium — Minute. 

 Ambigua — Ambiguous. 

 Corvus — Crow. 



Exilis- 



Pyrum — Pear» 



Marmorata — Marbled. 



Achatina — Agate. 



Lugubris — Black. 



Minima — Small. 



Inflata — Inflated. 



Albicans — White, 

 Repanda — Ventricose. 

 Opaca — Opaque. 

 Turgida — Inflated. 

 Cserulescens — Blueish. 

 Cinerea — Ashy-colored. 

 Undata — Waved. 

 Teres — Oblong. 

 Substriata — Substriated. 



Trigonostoma Triangular- 



[niouthed. 

 Tumida — Swollen. 

 Acicula — Tapering. 

 Peregrina — American. 

 Danubialis — Danube. 

 Turbinata — Turbinated. 

 Curvata — Curved, 

 -Thin. 



NERITA. — Nerite or Hoof-Shell. 



Animal — a Limax: Shell univalve, spiral, gibbous, /iat^ 

 tish at bottom; aperture semiorbicular or semilunar; 

 pillar-lip transversely truncate, flattish. 



This genus contains only seventy-six species, and (>at 

 few of any great beauty or rarity. 



