...The communication between the two chambers lies in anarrow slit over the septum, the Eustachian tube, e, being onthe outside of the septum and between it and the tympanum or eardrum, t... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...The only other character showing noticeablegeographic variation is the size of the tympanum...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Thesize of the tympanum relative to that of the eye is highly variable withinsamples of a given species...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Usually the tympanum is not differentiated in recently metamorphosed young,and the eye is proportionately large...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...—Diameter of tympanum 36...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...—The tympanum is concealed in S...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...Of thevarious measurements and proportions, the snout-vent length andthe relative size of the tympanum to the eye apparently are of moretaxonomic importance than the others (Table 1)...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...In all of thespecies the tympanum is at least partially covered by a heavy,dermal supratympanic fold, and in some specimens of H...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...A heavy dermal fold from posteriorcorner of eye above tympanum and curved downward to insertion offorearm; tympanum round, its diameter slightly more than its distancefrom eye...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...Heavy dermal fold from posterior corner of eye above tympanumand then to insertion of forearm; tympanum concealed above, itsdiameter about equal to its distance from eye...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...In adult males, the top and sides of thehead, anterior to the tympanum, are uniformly grayish green orbluish green; the mandibular and maxillary beaks are brighter,yellowish green...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...Ptychohylaignicolor differs from all of the other species in having the headslightly wider than long and the tympanum noticeably less than halfthe size of eye...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...;tympanum/eye, 54...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...1 per cent that of eye, separated from eye by distance equalto diameter of tympanum...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...The onlynoticeable morphological difference between the subspecies, except inthe size of the tympanum, is the shape of the snout...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...—Hyla pellita differs from all knownMiddle American Hyla, except mixe, mixomaculata,nubicola, and pinorum, by having a concealed tympanum...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...The tympanum is proportionately larger in females than in males; thevariation in size and proportions is given in Table 2...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
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