...But there remain some featureswhich are more likely to persist—height, shape of head, neck,build, and fingers; the timbre of the voice, the colour of the iris... 
Grant Allen 「An African Millionaire」
...The iris is dark brown...
William T. Hornaday 「The Extermination of the American Bison」
...The buffalo, like the elk, is sometimes found in Ceylon as analbino, with purely white hair and a pink iris...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...He noted the iris as “crimson...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...In life this frog had a pale tan dorsum with dark brown markings,yellowish tan posterior surfaces of thighs, grayish brown throat, andbronze iris...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...The color of the iris is variable, even infrogs from one locality...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...In life these tadpoles had dark brownish black bodies with golden and greenlichenous flecks; the tail was tan with dark brown markings, and the iris was agrayish bronze color...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...The iris was a bronze color in specimensfrom all three localities, as well as in the young mentioned in the followingparagraph...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...In the front of the eyethen, just behind the transparent surface, there is a sort of curtaincalled the iris, about the middle of which is a round hole...
Edward Jesse 「Anecdotes of Dogs」
...The iris is a muscular, pigmented curtain extending across the interior ofthe eye and having about its center an aperture termed the pupil...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The anteriorsurface forms the posterior boundary of the cavity containing the aqueoushumor, and the iris in its movement glides on it...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The eyes of the Grouse are of greatdepth and softness, with deep expandingpupils and golden brown iris...
Various 「Birds Illustrated by Color Photography [June, 1897]」
...A large ravine south of the river had been cleared of treesevidently several years previously, and it has now grown upmostly to sedges, grass, and iris in its more moist parts...
Lee Raymond Dice 「The Mammals of Warren Woods, Berrien County, Michigan」
...The ventral surfaces,including the vocal sac, are white; the iris is golden and flecked withblack...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The iris is a copper color...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The iris is a bright copper color...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The iris is golden...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The iris is pale goldenyellow...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
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