Stomatella, foot truncated posteriorly, an oper culum present, no epipodial tentacles.
Shell spirally coiled; epipodial tentacles present; operculum thick and calcareous.
Foot divided into two, posterior half bearing the operculum; a wide epipodial velum; shell turbinated.
The first is flaccid and sluggish in its movements, and has not much power of contraction; its epipodial lobes are enormously developed and extend far forward along the body; it gives out when handled an abundance of purple liquid, which is derived from cutaneous glands situated on the under side of the free edge of the mantle.
In the Amphipoda, the gills though arising from the inner side of the bases of the thoracic legs are probably also epipodial in nature.