Some websites for hydra and daphnia

Hydra:

http://www.virtuallaboratory.net/Biofundamentals/lectureNotes/Topic6-1_Communities.htm (look towards the bottom of the page)

http://cas.bellarmine.edu/tietjen/images/cnidarians.htm

and Wikipedia (as of this moment) is good on hydra:

http://en.wikipedia.org/wiki/Hydra_(genus)

Daphnia:

Wikipedia is good again:

http://en.wikipedia.org/wiki/Daphnia

Another daphnia page:

http://lhsfoss.org/fossweb/teachers/materials/plantanimal/daphnia.html