The hind-wings are dull brownish-grey, with the cilia paler.
The hind-wings are grey; the cilia are white with a cloudy line.
Some of the cilia are used for running or swimming, others for grasping or touching, and so on.
It is by means of these cilia that the animal moves through the water.
The Protozoan swims by the vibration of these cilia in the water.
The skin ...