I used the new Curves beta. First I created a cylinder primitive in Orthographic mode, as a guide, and created a curve along its edge.. I find the curves beta tools kind of weird, so what i did here way to put down three points in empty space, and then move them so the curve sat on the edge of the circle. There are probably several ways to get a perfect curve here.
Next, I right clicked on the curve and selected Attach Tube:
Then I duplicated the Sculpt layer and rotated it a few times: