The first branchi are attached near the middle of the dorsum, the others laterad close above the parapodia.
The parapodia are sometimes divided into distinct lobes or branches.
Each of the segments has a pair of parapodia, bearing a bundle of bristles and cirri.
The presence of parapodia distinguish this from other groups of Chaetopoda.
The lobes of the parapodia are widely separated and fringed with membrane, appearing like double parapodia.
On the ventral side of the parapodia are whitish tubercles with a dark spot in the middle.
Color of venter and parapodia grey; elytra at present grey over a fulvous ground.
parapodia are often lacking on the posterior parts and are usually without cirri.
Some species of Bulla have been seen to swim by means of the lazy flapping of the parapodia.
(b) Claws and fangs are developed on the branches or rami of the parapodia, not on the end of the axis or corm.