Shell rudimentary, entirely flat, sub-spiral, with a summit thick and very callous.
Dolabella Rumphii.
Dolabella fragilis.
D. Rumphii. Rumphius’s Dolabella.
Base thick, callous, and sub-spiral; dilated above, thin, and wedge-shaped.
FAMILY VI.
Limacinea. Five genera.
1. Onchidium. Has no shell. Two species.
Onchidium Typhæ.
Onchidium Peronii.