...On the Difference between the Human Membrana Tympani and thatof the Elephant... 
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...The delicate, spindle-shaped columellae lie ventral to the tegmen tympani andsquamosals, are spatulate distally, and have a broad basal attachment to theauditory region...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Specimens from the western part of the range (easternOaxaca) have slightly smaller heads and proportionately larger tympani thanthe more eastern populations ()...
William E. Duellman 「Middle American Frogs of the Hyla microcephala Group」
...The membrana tympani is larger than in other quadrupeds of the same size...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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