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UNIVALVES. HELIX. 



*Trifasciatus. 



* Mem branaceus. 



*Interruptus. 



*Subrufus. 



*Strigatus. 



*Albidus. 



*Carinatulus. 



*Clatliralulus. 



*(^rassus. 



*Puiictatus. 

 *Sheppeiaiius, 

 *Sandvicensis. 

 Obtusus. 

 Auriscalpiuni. 

 Politus. 

 Nautileus. 

 Obsoletus. 

 Qiiiiiquedciitatus. 

 Pyraniidalis'. 



HELIX. — Snail or Spiral, 



A nimal — a Limax ; Shell univalve, spiral, suhdiaphanont, 

 brittle ; aperture contracted, semilunar, or roundish. 



The genus Helix is the most lumierous of any ; it con- 

 tains no less than two hundred and sixty-seven species, 

 among which, some are of great beauty and rarity. By 

 far the greater proportion of species are the produce of 

 the land : many of the rest are the inhabitants of rivers 

 and fresh-waters, leaving but a very small residue natives 

 of the ocean. 



The Helices are, for the most part, shells of delicate and 

 brittle structure, and remarkable for their lightness; their 

 general form is closely allied to that of the common gar- 

 den or hedge-snail, except in those species which are ta- 

 pering or elongated. Among the carinated, Helices, or 



