Works Cited

   Hutchings, P. 2001. http://www.amonline.net.au/invertebrates/ann/index.htm

   Oceanic Research Group.1997. http://oceanireserch.org/mollusk.html

   National Wildlife Federation. November 24, 2000. http://www.cyhaus.com/marine/marine.htm

   The University of California Museum of Paleontology, Berkeley, and the Regents of the University of California. 2001 http://www.ucmp.berkeley.edu/arthropoda/arthropoda.html

   The University of California Museum of Paleontology, Berkeley, and the Regents of the University of California. 2001. http://www.ucmp.berkeley.edu/porifera/porifera.html

   Starr, C. 2000. Biology, Concepts and Applications. Brooks/Cole. United States of America.

   Australian Muesuem. 2001. http://www.amonline.net.au/invertebrates/mal/endangered/index.htm

   Dunn, G.A. 2001.    http://members.aol.com/YESedu/vanishin.html

  Oklahoma State University. April 15, 1998. http://www.okstate.edu/artsci/zoo_home/zoo_lrc/zool3104/echino-int.htm