UNIVALVES. TURBO. 113 



*Punctatus — Dotted. Politus — Polished. 



*Sheppeianus — Sheppy. Nautileus — Nautilus. 



*Sandvicensis — Sandwich. Obsoletus — Obsolete. 



Obtusus — Obtuse. Quinquedentatus — Five-toothed. 



Auriscalpium — Ear-pick. Pyramidalis — Pyramid. 



HELIX. — Snail or Spiral. 



A nimal — a Limax : Shell univalve, spiral, suh diaphanous, 

 brittle ; aperture contracted, semilunar, or roundish. 



The two hundred and sixty-seven species, which com- 

 pose this genus, are principally land or fresh water shells, 

 a few only being the produce of the ocean. They are 

 usually of a delicate and brittle structure, and remarkable 

 for their lightness; their general form resembles that of 

 the common garden or hedge-snail, except in those spe- 

 cies which are tapering or elongated. 



The first division consists of the carinated Helices, and 

 the more compressed or flattened species of the genus ; 

 which, from their shape, are commonly called Antique 

 Lamps. The H. lapicida, H. marginata, H. cicatricosa, 

 and H. scarabaeus have acute margins and are character- 

 istic of the carinated species. These shells were former- 

 ly supposed to have fallen in showers from the clouds. 



Of the Antique Lamps the H.lucerna, H. lampas, and 

 H. carocolla, are illustrative specimens. The rarest spe- 

 cies, are the H. ringens, H. Gualteriana, and the H. trica- 

 rinata or triple-keeled snail. 



The species of the second division areumbilicated, and 

 are much more globose or inflated in their forms; as the 



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