The volume of a conic section should be the same regardless of the coordinate system used. Thus, I have attempted to calculate the volume of a two-sheeted hyperboloid in both rectangular and psuedo-spherical coordinates (q.v. attached pdf file). I am fairly confident the calculations in rectangular coordinates are correct, but much less so for the pseudo-spherical coordinates. The psuedo-spherical coordinates do not really represent real coordinates, rather they are mapped coordinates. Be that as it may, I would welcome someone who can identify the error(s) in my work.