Closely allied to the Aplysia; it is a singularly formed shell,
difficult to describe, as it contains few of the characteristics which
distinguish other shells.
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.