10-15m deep, Chiba prefecture, Honshu, 148mm. The species is large, rounded,
heavier than discus or madaka, and the colour is mainly brick-red, with paler radial bands.

The depressed spire is sometimes visible in ventral view. No muscle scar.
Smooth shells like this one are not common: most of them are quite bumpy.
A typical feature is, at the extremity of the row of holes, the triangular shape of the margin;
some shells thus present a kind of remarkably marked "tail".

Row of holes: it runs along a angulous crest. Holes themselves are often elevated, tubular,
drawing a short crenelated crown upon the anterior dorsal area.

The dorsal side is like an old folded cliff. Few holes are open; usually less than six.