File:The American journal of science (1890) (17963266418).jpg

Title: The American journal of science
Identifier: americanjourna3391890newh (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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0, C. Marsh—Characters of the order Hallopoda. 417 The main characters of the posterior limbs are shown in the figure below, which represents the bones of the left leg* and foot, natural size, in the position in which they lay when un- covered. All the bones figured are still firmly embedded in the matrix.
Text Appearing After Image:
Left leg and foot of Hallopus victor, Marsh; natural size; side view, a, astragalus: c. calcaneum; d, tarsal; /, femur; t, tibia; II, second metatarsal; V, remnant of fifth metatarsal. There are but two vertebrae in the sacrum. The other vertebrae preserved have their articular faces bi-concave. The chevrons are slender and very elongate. Taken together, the known characters of Hallopits indicate Dinosaurian affinities rather than those of any other group of reptiles, and if the Dinosauria are considered a sub-class, the Hallopoda at present may be regarded as an order of Dinosaurs standing more apart from typical forms than any other. The characters which now indicate the position of the Hallopoda among the Reptilia, living and extinct, are given below. The discovery of more perfect specimens, however, especially of the skull, must be awaited before their nearer affinities can be determined. DINOSAUMA ? Order Hallopoda (Leaping Foot). Carnivorous. Feet digitigrade, unguiculate. Fore limbs very small, with four digits in manus. Hind limbs very long, with three digits in pes, and metatarsals greatly elongated. Calcaneum much produced backward. Vertebrae and limb bones hollow. Two vertebrae in sacrum. Acetabulum formed by ilium, pubis, and ischium. Pubes rod-like, projecting downward, but not coossified distally. No post-pubis. Ischia with distal ends expanded, meeting below on median line. New Haven, Conn., April 21st, 1890.

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