English: Female of Purpura lapillus (=Nucella lapillus) removed from its shell; the mantle-skirt cut along its left line of attachment and thrown over to the right side of the animal so as to expose the organs on its inner face.

a, Anus.

vg, Vagina.

gp, Adrectal purpuriparous gland.

r′, Aperture of the nephridium (kidney).

br, Ctenidium (branchial plume).

br′, Parabranchia (= the comb-like osphradium or olfactory organ).