Dugesia - The anatomy of the turbellarian flatworm Dugesia tigrina, commonly known as planaria. www.science.lander.edu/rsfox/dugesia.html
Marine Flatworms of the World - This site is mainly devoted to the Polyclads, an order of brightly-colored tropical platyhelminths. A long and detailed presentation of the Platyhelminthes, and hundreds of beautiful pictures of living specimens. www.rzuser.uni-heidelberg.de/~bu6/index.html
Turbellaria - Introduction to the biology of the freshwater Turbellaria, by S.M. Mandaville. www.chebucto.ns.ca/Science/SWCS/ZOOBENTH/turbella.html