turritella

[Mod. Lat., dim in. from Lat. turris a tower.] 1. Zool .: Tower-shells; the type-genus of Turritel. lidæ (q. v.), with seventy-three species, universally distributed, ranging from the laminarian zone to a depth of 100 fathoms. Shell turreted, many-whorled, and spirally IMG:content-1583.png:[merged small][merged small][merged small][graphic] rounded, peristome thin; operculum with a fimbriated lat a. margin. 2. Palæont.: Fo il species, 172, from the Neoco mian onward.