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Ed Cutler's Sipuncula Research
http://www.mcz.harvard.edu/Departments/InvertZoo/cutler.htm
Includes detailed classification of the 144 species in Phylum Sipuncula.
Introduction to the Sipuncula
http://www.ucmp.berkeley.edu/sipuncula/sipuncula.html
Introduction to the peanut worms, from UCMP Berkeley.