File:The American journal of science (1895) (17529105644).jpg

Title: The American journal of science
Identifier: americanjourna3501895newh (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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Text Appearing Before Image:
O. C. Marsh—On Dinosaurian Reptiles. 487 pelvis and hind limb, as being especially characteristic, we find in the existing Alligator, as represented in the diagram (figure 2), that the pubic bone is excluded from the acetabulum, articulating alone with the ischium, and not at all with the ilium. The calcaneum, moreover, has a posterior extension. In Aetosaurus, as shown in the corresponding diagram (figure 3), the pubic bone forms part of the acetabulum, as in Dinosaurs and Birds, and this is a noteworthy difference from all the existing Crocodiles. The hind foot, however, is of the Crocodilian type, with the calcaneum showing a posterior projection.
Text Appearing After Image:
Figure 7.—Diagram of pelvis of Belodon Kapffi, ron Meyer; seen from the left. One-fourth natural size. a, acetabular surface, within dotted line; il, ilium; is, ischium; p, pubis. In Belodon, the pelvis of which alone is here represented (figure 7), the pubis contributes a very important part to the formation of the acetabulum, and to the entire pelvic arch. The latter differs from the pelvis of a typical Dinosaur mainly in the absence of an open acetabulum, but a moderate enlarge- ment of the fontanelle at the junction of the three pelvic elements would essentially remove this difference. A more erect position of the limb, leading to a more distinct head on the femur, might possibly bring about such a result. The feet and limbs of Belodon are Crocodilian in type.

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