British Vertigos » Family: Vertiginidae » Direction of coiling »
In the family Vertiginidae the shell may be coiled dextrally or sinistrally.
DEXTRAL. Right-handed coiling; when the mouth is on the observer's right and the apex is directed upwards, and with the mouth facing the observer – as in the image to the right.
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SINISTRAL. Left-handed coiling; when the mouth is on the observer's left when the apex is directed upwards, and with mouth facing the observer – as in the image to the left.