Caracol, a conch, a univalve shell.
"The Arawack Language of Guiana in its Linguistic and Ethnological Relations"
Daniel G. Brinton
On the other hand, Voluta, Fasciolaria, and other genera of univalve shells, usually met with only in tertiary strata, occur.
"The Student's Elements of Geology"
Sir Charles Lyell
The imbedded shells are chiefly casts, many of them of univalve mollusca, which are usually very rare in the white chalk of Europe.
"The Student's Elements of Geology"
Sir Charles Lyell