. The dinosaurs of North America. Dinosaurs. 172 DINOSAURS OF NORTH AMERICA. solid throughout, and the same is true of the chevrou, tigs. 4 and 5. The ueural spines of the anterior caudal vertebra; are elevated and massive. The summit is cruciform in outline, due to the four strong buttresses which unite to form it. The median caudals all have low, weak spines, and no transverse processes. The posterior caudals are elongate and without spines or zygapophyses. THE PELVIC ARCH. The pelvic bones in the present species are shown in fig. 16. The ilium represented is not quite perfect on its upper m
. The dinosaurs of North America. Dinosaurs. 172 DINOSAURS OF NORTH AMERICA. solid throughout, and the same is true of the chevrou, tigs. 4 and 5. The ueural spines of the anterior caudal vertebra; are elevated and massive. The summit is cruciform in outline, due to the four strong buttresses which unite to form it. The median caudals all have low, weak spines, and no transverse processes. The posterior caudals are elongate and without spines or zygapophyses. THE PELVIC ARCH. The pelvic bones in the present species are shown in fig. 16. The ilium represented is not quite perfect on its upper margin. Its ante- rior process for the support of the pubis is much larger than the poste-. Fig. 16.— Pelvis of Brontosaurun excelsus; seen from tbe left. One-sixteenth natural size. a, acetabulum; /, foramen in pubis; £2, ilium; w, ischium; p, pubis. rior one which meets the ischium. The pubis is elongate and massive. It sends down a strong wing for union with the ischium, and has in front of this the usual foramen. The distal end is expanded, and has on the inner surface a rugose facet for union with its fellow by cartilage. The ischium is more slender than the pubis, and has its lower end expanded for symphysial union with the one on the other side (PL XXIV, figs. 1 and la). This pelvis is more like that of Atlantosaurus. 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 Marsh, Othniel Charles, 1831-1899. Washington, Govt. Print. Off.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherwashi, bookyear1896
