Benthomangelia macra

It is fragile, translucent white, glossy, feebly ribbed and spiralled, with a stumpy subscalar spire, ending in a large, conical, sculptured, sharp-tipped dome, and with a small body whorl, contracted base, and produced snout.

The surface is covered with very obsolete broadish threads, which are crowded on the body, but on the base are stronger, more regular, and wider apart.

The spire is subscalar, narrow, and would be high but for the abruptness with which it is crowned by the apex, consisting of four yellow conically globose whorls, of which the last is large and dome-shaped, and the first minute, prominent, but at the very tip slightly bent down.

The aperture is small, narrow, pear-shaped, triangular above, and produced below into the relatively broad, open, and deep siphonal canal.

The edge, which is quite independent of the ribs, is very convexly prominent below, with a high and advancing shoulder, above which lies the deep, open-mouthed, rounded sinus.