Perhaps the reference is to Willis (1835) p.61:
Amongst Italian tracery, may be found both geometric and flowing specimens, but always with upright compartments; that is, compartments which may be divided symmetrically by a vertical line. Those in which the compartments recline to the right and left in pairs like plumes...are never found in Italy. Their most common patterns of tracery are geometrical, in which one, two, or more arched lights occupy the lower parts of the , and the space between that and the head is filled with circles.
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[Version 0.05: May 2008]