Up to 60mm long, 60mm high, 45mm across, adults plump and round, perhaps a little produced posteriorly but not keeled. About 20 strong radial ribs, fewer in juveniles.

Shell up to 100mm long, 90mm high, 85mm across, juvenile shells round or oval, noticeably longer than high, larger shells becoming plumper and more rhombic with age, developing an angulation or kee

Brittle shell up to about 1cm in length. Dirty white in colour and appears iridescent. The surface is sculptured with fine concentric rings. Has a deep pallial sinus which is partially confluent with the pallial line.

Shell up to about 2.5 cm in length. Outside and inside of shell white. Semi transparent and polished. Sculptured with very fine concentric rings. Deep pallial sinus which is partially confluent with the pallial line.

Shell up to just over 1cm long. Glossy, pearl white and sometimes translucent. Sculpture - fine concentric rings. Interior of shell translucent and glossy. Deep pallial sinus which is partially confluent with the pallial line.

Brittle shell up to about 2cm in length. Interior and exterior of shell white and polished. Sculpture of fine concentric rings. Deep pallial sinus which is partially confluent with the pallial line.

Fragile shell up to 3mm in length. It is coloured dirty white with a red tint both inside and outside. The surface of the shell is sculptured with concentric and raditaing lines.

Brittle shell up to 30cm in length. It is light to dark brown in colour both inside and outside but inside is glossy. The surface is sculptured with concentric lines and 8 to 12 radiating ribs. There are no teeth on the hinge.

6-8mm

Boettgerilla pallens Simroth 1912

Small to medium slug, extended length 3 – 4 cm. Pale translucent greyish-yellow, with keel from tip of tail right up to edge of the mantle; back and head darker bluish-grey. Very narrow, almost worm-like, when fully extended. Sole pale yellow, mucus colourless.