A) Protonephridia - iv) Flatworms

A protonephridia is a network of dead-end tubules that lack any internal openings and are found in Platyhelminthes, Chordata etc. The ends described are called flame cells if they are ciliated and if not then solenocytes. The main function is osmoregulation.

B)Nephridia- iii)Earthworms

Nephridia are coiled tubular duct-like structures that are responsible to filter and remove wastes from the body of an earthworm. The nephridia are usually grouped in pairs throughout the different segments of the earthworm's body.

C)Maphigian tubules - ii) Cockroach

The Malpighian tubules have excretory and osmoregulatory function. The tubules are branched and extends from the alimentary canal absorbing solutes, water etc.

D) Green gland or Antennal Gland - i) Prawn

The glands that perform the excretory function in prawns is the antennal glands or the green glands. It is a pair of large glands present in some crustaceans like prawns which have an excretory function and would usually open at bases of the large antennae.