Sources

http://www.sheppardsoftware.com/animalpages/animal-family-6.htm

http://www.oceaninn.com/guides/mollusks.htm

http://www.greenfacts.org/glossary/mno/mollusk.htm

http://www.bishopmuseum.org/research/natsci/waipiostudy/students/meet_the_critters/mollusks/introduced/Pomacea_canaliculata.htm

http://hometown.aol.com/ksmith9526/MolluskInformation.htm

www.mcwdn.org/Animals/Mollusks.html

www.sci.sdsu.edu/classes/bio201/mol.annel.htmlhttp://www.sheppardsoftware.com/animalpages/animal-family-6.htm