How to refer to MOOC on an academic CV?
This answer is based purely on my own experience - 


I applied for a job a few months ago, and had recently completed a MOOC relating to an aspect of the project that I did not need to be qualified for, but demonstrated I had an interest in that area.  Rather than add it to my CV, I mentioned it in the covering letter.
Personally, I wouldn't want to clutter the academic CV too much or detract from my main qualifications - I wouldn't put it under the Academic Qualifications section for instance. However, I sometimes include a section at the end of the CV entitled 'Workshops and Classes Attended' which I tailor to include things that are relevant to a particular role, so I might put a MOOC there if it related to a position I was applying for.