Title: The American journal of science
Identifier: americanjourna4181904newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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G. R. Wieland— Upper Cretaceous Turtles. 189 and the Osteopyges, which are broadest across the anterior end of the sixth neuraL In the present more primitive turtle the cordate form of the Chelonine carapace is beginning to appear, the swinging back of the eighth rib into a pit of the eleventh marginal, and the consequent leaving of the tenth
Text Appearing After Image:
Figure d.—Lytoloma angusta Cope (Yale specimen 625). Natural size. Vertical middle transverse section through the 4-11, and pygal (pm) mar- ginals. Eespective rib pits in dotted outline, marginal without a supporting rib, as in Ghelone, having already occurred. Compare plates Y and YI. In Osteopygis Gibbi the femur is longer than the humerus, and from general comparison it may be argued that in the present species of Lyto- loraa the femur is relatively shorter thau in Osteopygis^ but not so shortened as in the existing marine turtles. This inter- mediate development is an important point. .

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