...Below the auditory canal is situated a round prominence,highly developed in carnivora; this is the tympanic bulla,also called the mastoid protuberance; it is an appendage ofthe tympanum... 
Édouard Cuyer 「Artistic Anatomy of Animals」
...Blanford had larger auditory bullæ than either theEuropean fox or V...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Shortly thereafterthe anterior arm of the squamosal ossifies, the distal part of the columellaappears, and the anterior and lateral parts of the auditory region ossify...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Acoustic nerve: connects the auditory pits or otherorgans of hearing with special ganglia...
John. B. Smith 「Explanation of Terms Used in Entomology」
...7); breadth across auditory bullae, 12...
Rollin H. Baker 「Mammals taken Along the Alaska Highway」
...3; greatest depth of skull including auditory bullae, 9...
Rollin H. Baker 「Two New Moles (Genus Scalopus) from Mexico and Texas」
...In front under the forehead we can see thefirst pair of gill-arches; underneath is the S-shaped heart, at the sides ofwhich are the auditory vesicles...
Ernst Haeckel 「The Evolution of Man」
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