Here is my question

Evaluate the triple integral where is bounded by the parabolic cylinder and the planes and .

I set up dV to be dzdydx and the bounds to be {z,0,16-y^2}, I am confused on what to do for y, and {x,-4,4}. I tried {y,-4,4} because that is where the function crosses the z=0 plane, but when I evaluated it, it ended up to be incorrect. Any help would be greatly appreciated.