Charles Bell, The Anatomy of the Brain explained in a Series of Engravings, 1802.
Alas for Secundus, his publication only made matters worse, as demonstrated by Sir Charles Bell in 1802. Bell also trained in Edinburgh, but ended up in London. He too was a well-known and respected anatomist, and was a skilled illustrator. In this illustration, the foramen is shown at O, and is described but not named. A few pages later, Bell concludes this publication with a vitriolic attack towards Dr Monro (Secundus) on several fronts. Bell accuses Monro of assuming the merit of discovering the foramen, based on the suggestion that Monro purposefully mentioned earlier anatomists who had made imperfect discoveries, in order to make his own account more credible.
Charles Bell, The Anatomy of the Brain explained in a Series of Engravings. London: Printed by C. Whittingham, 1802. Med. WL300 B433