UNIVALVES. — HELIX. 



119 



♦Putris — Yellowish. 

 Acuta — Pointed. 

 Papilla — Nipple. 

 Minuta — Minute. 

 Detrita — Smooth-rayed. 

 Ventricosa — Ventricose. 

 *Obscura — Small brown. 

 *Lubrica — Glossy. 

 Limosa — Rough. 

 Contortuplicata — Coil-plaited. 

 Angularis — Angular. 

 * T entaculata — Olive. 

 *Auricularia — Eared. 

 *L3evigata — 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. 

 T urgida — Inflated. 

 Cserulescens — Blueish. 

 Cinerea — Ashy-cohred. 

 Undata — Waved. 

 Teres — Oblong. 

 Substriata — Substriated. 



Trigonostoma Triangular- 



[rnouthed. 

 T umida — Swollen. 

 Acicula — Tapering. 

 Peregrina — American. 

 Danubialis — Danube. 

 Turbinata — Turbinated. 

 Curvata — Curved, 

 -Thin. 



NERITA. — Nerite or Uoof-Shell. 



Animal — a Limax: Shell univalve, spiral, gihhous , fiat' 

 tish at bottom; aperture semiorhicular or semilunar i 

 pillar-lip transversely truncate, flattish. 



This genus contains only seventy-six species, and but 

 few of any great beauty or rarity. 



