Sea cucumber species

Images: 
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It's a sea cucmber, but, to me, it does not match any of the photos in Humann & Deloach.  Is it a furry sea cucumber or a donkey-dung sea cucmber?  I am leaning toward donkey dung.  Am I right?

 

About 16-inches long, December 1, 2011, Snapper Ledge, buoy SL-1, Key Largo, Florida, 29-foot depth, 77 degrees Fahrenheit bottom temperature.

 

Thank You,

Marty

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