| Tenagodus, Siliquaria, Caenogastropoda, Turritella|
Tenagodus anguinus is a species of unusual sea snail, a marine gastropod mollusk in the family Siliquariidae, the slit worm shells.
Tenagodus anguinus Wikipedia
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 inches (200 mm).
Tenagodus anguinus is found in the Indian Ocean including around Madagascar.