. Bulletin - American Museum of Natural History. Natural history; Science. (1181) Article IX.—ON TWO INTERESTING GENERA OF EOCENE TURTLES, CHISTERNON LEIDY AND ANOSTEIRA LEIDY. By Oliver P. Hay. The genus Chisternon was proposed in 1872 by Dr. Joseph Leidy (Proc. Acad. Nat. Sci. Phila., p. 162) for the reception of his earlier described Baena undata. The character which led Dr. Leidy to found the genus was the presence of a pair of mesoplastral bones. At that time the presence of the same bones in Baena arenosa, the type of the genus Baena, had not yet been obser\^ed. When these ha
. Bulletin - American Museum of Natural History. Natural history; Science. (1181) Article IX.—ON TWO INTERESTING GENERA OF EOCENE TURTLES, CHISTERNON LEIDY AND ANOSTEIRA LEIDY. By Oliver P. Hay. The genus Chisternon was proposed in 1872 by Dr. Joseph Leidy (Proc. Acad. Nat. Sci. Phila., p. 162) for the reception of his earlier described Baena undata. The character which led Dr. Leidy to found the genus was the presence of a pair of mesoplastral bones. At that time the presence of the same bones in Baena arenosa, the type of the genus Baena, had not yet been obser\^ed. When these had been dis- covered in the species just mentioned, by Cope, in 1884, there appeared to be no reason for retaining Chisternon. Recently the writer has been studying the species of the Baenidse, and he has found, as he thinks, sufficient reasons for reviving Leidy's Fig- 1.—Chisternon hebraicutn Leidy. Portion of carapace, c. /. 7., first costal plate ; c. s. /., first costal scute ; n. I. n. 2., first and second neurals ; nn., nuchal bone ; pren., preneural ; scs., supernumerary costal scute. In such specimens of Baena as have not the sutures wholly oblit- erated by coossification of the bones it is seen that the nuchal bone 155. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original American Museum of Natural History; Allen, J. A. (Joel Asaph), 1838-1921. New York [American Museum of Natural History]
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