WHAT THE "L" IS IT?
'(<a href="http://www.j-archive.com/media/2007-04-12_DJ_14.jpg" target="_blank">Cheryl of the Clue Crew reports from the state-of-the-art Jeopardy! marine biology laboratory.</a>)  This clinging <a href="http://www.j-archive.com/media/2007-04-12_DJ_14a.jpg" target="_blank">marine  gastropod</a> is also the last name of Don Knotts's character in a 1964 marine movie'
a limpet