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An archaic name for the Torus.
References
Eisenhart, L. P.  A Treatise on the Differential Geometry of Curves and Surfaces.  New York: Dover, p. 314, 1960.
 
Stacey, F. D.  Physics of the Earth, 2nd ed.  New York: Wiley, p. 239, 1977.
 
Whittaker, E. T.  A Treatise on the Analytical Dynamics of Particles & Rigid Bodies, 4th ed.
  Cambridge, England: Cambridge University Press, p. 21, 1959.