Snap Ring holding axle in place

Hey all
I bought a 1968 Cuda with a 8 3/4 rear end
Today when I tried to pull the axles to deal with the brakes and a leak in the diff I noticed it has Strange axles and what looks like a retaining ring
I have never seen this, how do I remove this so I can pull the axle

thanks

God Bless you all for ur help