| Diagnosis |
Shell: thin, light but not very fragile, spire, moderately high, elongated oval in appearance, convex whorls, with markedly caniculated suture; swelling at the base of the shell around the umbilicus; oval aperture has a tapered outer lip and an inner lip that has a callus confined to the posterior half, which covers part of the ventral surface of the last whorl; no sculpture, smooth and glossy surface; cream-colored base, darkish-brown spots in spiral rows arranged as axially broken bands; thin dark-brown periostracum covers the surface; operculum is horny, light chestnut with an apical nucleus. Body: well-developed foot, head has two tentacles with an eye at the base of each and one long retractile proboscis; mantle has a very long siphon; mantle cavity contains the gill, osphradium and in males the penis, behind the right tentacle; radula is rachioglossan. |