Mermaid 

This would have been a bit much for the ref desk. See if any of these is what you were looking for.
http://commons.wikimedia.org/wiki/File:SekienNingyo.gif
http://www.elfwood.com/~nobbynobody/Deep-Sea_Mermaid.3092594.html
http://tbn2.google.com/images?q=tbn:-5ze1FwZdo4O3M:http://www.orkney.gov.uk/media/heritage/Nuckelavee.jpg
http://www.pinktentacle.com/images/mermaid_12.jpg
http://rlv.zcache.com/mermaid_with_statue_poster-p228068496710159489td2h_210.jpg
http://th08.deviantart.net/fs46/150/i/2009/202/4/4/Mermaid_Lineart_by_KennedyxxJames.jpg
http://1.bp.blogspot.com/_mlPoGU4VqSk/SC2anQAAf3I/AAAAAAAACZY/9ZWR85w16UA/s400/mermaid+real.jpg
http://www.mainlesson.com/books/wiggin/fairy/zpage178.gif
http://sludge.files.wordpress.com/2006/10/3af71ea1-57ee-41a0-9386-0396523a0b89.gif
http://images.elfwood.com/art/l/a/lantathae/the_fish_woman.jpg
http://www.gutenberg.org/files/23405/23405-h/images/image30.png
http://2.bp.blogspot.com/_UqqAc-UQWQw/RydWicj7qAI/AAAAAAAAAQ8/kPIIVNfnEeI/s400/Mermaiden%2Bsketch.jpg
http://img3.ak.crunchyroll.com/i/spire2/08162008/f/5/c/4/f5c417b7ac5dd0_full.jpg
Happy nightmares -)71.236.26.74