Tenagodus anguinus

Tenagodus anguinus is a species of unusual sea snail, a marine gastropod mollusk in the family Siliquariidae, the slit worm shells.

Description
The shell is thick and irregularly coiled in a gradually tapered spiral, with rather distant whorls. It has longitudinal ridges with spines on them throughout its length. It is generally a dirty-looking white colour, pale yellow or buff. The uncoiled length could be up to 8 in.

Distribution
Tenagodus anguinus is found in the Indian Ocean including around Madagascar.