Poriferans...

...or sponges as they are commonly known.

Carnivorous Sponges

http://www.accessexcellence.org/WN/SUA04/carniverous_sponge.php
http://www.timesonline.co.uk/tol/news/world/article1801133.ece

Glass Sponges

This is a close up of one kind of glass sponge.



Here are a couple sites that talk about sponges. They are pretty simple but the have the information that one might need, as well as images.

http://www.ucmp.berkeley.edu/porifera/poriferamm.html

http://www.biology.ualberta.ca/faculty/sally_leys/uploads/personal/Glass%20sponge%20ecology.htm

http://www.microscopy-uk.org.uk/mag/indexmag.html?http://www.microscopy-uk.org.uk/mag/artjun06/rh-florida.html