TENTACULITE

Etymology

Noun

tentaculite (plural tentaculites)

(paleontology) Any of numerous species of small, conical shells found in Paleozoic rocks, fossils from the extinct genus Tentaculites.

Source: Wiktionary

Ten*tac"u*lite, n. (Paleon.)

Definition: Any one of numerous species of small, conical fossil shells found in Paleozoic rocks. They are supposed to be pteropods.

Source: Webster’s Unabridged Dictionary 1913 Edition