I found this cactus and I was wondering if someone could identify it for me?

TIA

Both pics are of the same cactus

That's a huernia zebrina! I love them. It's not a cactus and is actually related to milkweeds. Grow it like a cactus, though, lots of sun and not much water.

http://www.succulent-plant.com/huernia.html

Thanks so much