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The pores of the water-stomata are the outlets of the hydathode.
Orifices of the zooecia often separated by pores (mesopores).
Distichopora has the pores arranged in rows.
Thus, among the Oligochaeta there are often a series of dorsal pores, or a single head pore, present also among the Polychaeta (in Ammochares).
Even in the larger Heteronemertines these pores are only a few millimetres behind the mouth region.
