Origin of dextral
Examples from the Web for dextral
The bead illustrated in Fig. 6 has been made from the column of some dextral whorled shell.
It has been made from the broad beak of a Strombus or dextral whorled Busycon.
A genus of minute land shells, resembling Vertigo, but separated because they are dextral, while Vertigo is sinistral.A Conchological Manual|George Brettingham Sowerby
Dextral animals, with shell coiled pseudo-sinistrally; operculum with sinistral spiral; pallial cavity dorsal.
Sinistral: Having the aperture of the shell at the left; opposite of dextral.The Sea-beach at Ebb-tide|Augusta Foote Arnold