sentences:  The vascularized mantle cavity is reduced, and a series of blind tubules radiate from it, being surrounded blood vessels.This allows for a more compact lung structure in these generally flat animals.Species in this family are found in eastern Australia, New Zealand including its sub-Antarctic islands, Bismarck Archipelago, the Admiralty Islands, the New Hebrides, New Caledonia, as well as on the Melanesian islands north to New Caledonia and New Britain, Papua New Guinea.