ClipArt ETC
"Patella vulgata, seen from the ventral side. f, foot; g.l, circlet of gill lamellae; m. e, edge of the mantle; mu, attachment muscle; sl, slits in the attachment muscle; sh, shell; v, efferent branchial vessel; v', aorta; ve, smaller vessels." -Parker, 1900

Limpet

"Patella vulgata, seen from the ventral side. f, foot; g.l, circlet of gill lamellae; m. e, edge of…