It looks likely to contain some fresh-water polyzoa, than which there are few more beautiful tenants of the water.    From Wordnik.com.  [Country Walks of a Naturalist with His Children] Reference

You will often find other forms of polyzoa in clear ponds and mill-pools; sometimes you would suppose you were looking at a mass of sponge, as in the case of.    From Wordnik.com.  [Country Walks of a Naturalist with His Children] Reference

Mollusca, rotifers, polyzoa, and such infusoria as are not included in types (1) and (2) belong to the massive type, in which the body and its parts form rounded masses.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

Big-mouthed fish, worms, spiders, anemones, sea-cucumbers, polyzoa, prawns, little fish like sardines, one spiky fish like nothing on earth, starfish and octopus, limpets with jointed shells, sponges, ascidians; isopods, and all kinds of sea lice.    From Wordnik.com.  [South with Scott] Reference