The dinosaurs of North America (1896) (20768549728)

Title: The dinosaurs of North America

Identifier: dinosaursofnort00mars (find matches)

Year: 1896 (1890s)

Authors: Marsh, Othniel Charles, 1831-1899

Subjects: Dinosaurs

Publisher: Washington, Govt. Print. Off.

Contributing Library: Smithsonian Libraries

Digitizing Sponsor: Biodiversity Heritage Library

Text Appearing Before Image:

154 DINOSAURS OP" NORTH AMERICA. that now many of the more important characters of the group can he determined with certainty. FORE AND HIND LIMBS. In its present condition the specimen shows both the fore and hind limbs in good preservation, portions of the scapular arch, and appar- ently the entire pelvis and sacrum, various vertebra?, ribs, and other parts of the skeleton. It is doubtful if any portions of the skull are sufficiently well preserved for determination. On PL VI are given out- line restorations of the fore and hind limbs of this specimen. The scapula is of moderate length, and its upper portion broad and thin. The humerus is slender, with a strong radial crest. The shaft is very hollow, with thin walls, and the cavity extends almost to the distal end. The latter is but little expanded transversely. The radius and ulna are short, and were closely applied to each other. There were but four di slender. Sits in the maims, the first being short and stout, and the others

Text Appearing After Image:

Fin. 3.—Left leg and foot of Hallopun victor Marsh; side view. Natural size. a, astragalus i c calc mm; d, tarsal; /, femur; t, tibia; //, second metatarsal; V, remnant of fifth metatarsal. All three pelvic bones aided in forming the acetabulum, as iu typical dinosaurs. The ilia are of the carnivorous type, and resemble in form those of Megalosaurus. The pubes are rod-like, and projected down- ward and forward. The distal ends are closely applied to each other, but not materially expanded, and in the present specimen are not coossilied with each other. The ischia projected downward and back- ward, and their distal extremities are expanded, somewhat as in the Crocodilia. The femur is comparatively short, with the shaft curved and very hollow. The tibia is nearly straight, much longer than the femur, and its shaft equally hollow. The fibula was slender and complete, but tapered much from above downward. Its position was not in front of the tibia, as in all known dinosaurs, but its lower extremity was out- side, and apparently somewhat behind, the tibia. The astragalus is large, and covered the entire end of the tibia, but was not coossifled with it. The calcaneum is compressed transversely,

the dinosaurs of north america book illustrations natural history government printing office dinosaurs paleontology images from internet archive

1896

Smithsonian Libraries

http://commons.wikimedia.org/

public domain