Another snail, Planorbis planorbis
A group of ostracods, small bivalved crustaceans, and a copepod towards the left of the image.
There are also a few water slaters and planarians, but they didn't show as well today.
UPDATE: Thank you to Richard Comont for the pond snail ID, now corrected.
Online aquatic snail identification guide from the Conchological Society. here.