Camera DSLR lens fitting?

I recently bought a Samyang 8mm T3.8 CS V-DSLR Video Fisheye Lens for Canon and all though it claimed to fit my camera it doesn't seem to fit and by looking at the lens mount it looks like it's designed for Nikon;

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I'm going to take it back soon, however I was just wondering if there was an adaptor I could use for to mount the lens to my camera.

My camera is a Canon 600D - T3I

If they sent you the wrong lens, call them and return it for the correct lens