http://www.sidwell.edu/us/science/vlb5/Labs/Classification_Lab/Eukarya/Animalia/Porifera/
http://www.teaching-biomed.man.ac.uk/bs1999/bs146/biodiversity/porifera.htm
http://www.meer.org/M27.htm
http://library.thinkquest.org/28751/review/animals/1.html

Class Calcarea

Sycon (formerly known as Scypha, and Grantia), Leucosolenia

Class Hexactinellida

Venus's flower basket, glass sponges

Class Demospongiae

Spongilla, bath sponges, live marine tube sponges, encrusting sponges in marine tanks. Almost all sponges on display belong to this class.