What is "turbinella pyrum"

Sankha \Sank"ha\, n. [Skr. [,c]ankha a shell.] A chank shell ( Turbinella pyrum); also, a shell bracelet or necklace made in India from the chank shell.

Chank \Chank"\ (ch[a^][ng]k), n. [Skr. [,c]a[.n]kha. See Conch.] (Zo["o]l.) The East Indian name for the large spiral shell of several species of sea conch much used in making bangles, esp. Turbinella pyrum. Called also chank shell.

Turbinella pyrum, common names the chank shell, sacred chank or chank, also known as the divine conch, sometimes referred to simply as a conch, is a species of very large sea snail with a gill and an operculum, a marine gastropod mollusk in the family Turbinellidae. This species occurs in the Indian Ocean.

The name "chank" for the shell of this species is derived from the Indian word shankha, the divine conch. The old generic name was Xancus. The Dutch used to call them chianco. 1