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helix

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helix

In mathematics, a three-dimensional curve resembling a spring, corkscrew, or screw thread. It is generated by a line that encircles a cylinder or cone at a constant angle.

Helix

Genus of snails. H. hortensis is the common European snail, and H. pomatia, also found in Britain, is the Roman snail.

Classification

Helix is in subclass Pulmonata, class Gastropoda, phylum Mollusca.



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And I found that several species did in this state withstand uninjured an immersion in sea-water during seven days: one of these shells was the Helix pomatia, and after it had again hybernated I put it in sea-water for twenty days, and it perfectly recovered.
The Origin of Species by Darwin, Charles View in context
Of land-shells I collected sixteen kinds (and two marked varieties, of which, with the exception of one Helix found at Tahiti, all are peculiar to this archipelago: a single fresh-water shell (Paludina) is common to Tahiti and Van Diemen's Land.
The Voyage of the Beagle by Darwin, Charles View in context
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