Sentence:  Zuckerkandl (1893) gives far and away the greatest measurements for the <WSD>choanae</WSD>; Hopmann (1895) reported that in man the <WSD>choana</WSD> has a mean height of 27 mm, and a mean width of 13 mm (Merkel, 1896); in women it measures 25 x 12mm. These values agree closely with our findings. 
Meaning of the word marked with <WSD> tags:  An opening towards the back of the nasal cavity; the posterior nasal aperture.