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To the Editor.—Although the question brought up by Dr. Gacek might hardly be of sufficient interest to a reader not familiar with this highly specialized problem, I gladly follow your kind invitation to comment on Dr. Gacek's remarks. In describing the structure interpreted by me as crista quarta (1961), I mentioned the absence of nerve fibers and pointed out that the side walls of the formation are covered with cuboideal, the crest with columnar epithelium in which, due to poor preservation, no further details can be made out. It is difficult for me to perceive how Dr. Gacek could conclude from the examination of a photomicrograph with certainty that sensory elements were absent when I, after a thorough study of the microscopic slides was unable to come to a definite opinion. Dr. Gacek furthermore does not take the fact into consideration that the structure in question is covered