. The dinosaurs of North America. Dinosaurs. MARSH.] 235 during the life of the animal, an essential part of the remarkable leap- ing foot to which it belonged, and in which it has since kept its posi- tion undisturbed. The presence of such an element in the foot of this diminutive dinosaur certainly suggests that the group Hallopoda, which the writer has here considered a suborder, stands somewhat apart from the typical Theropoda, but not far enough away to be excluded from the subclass Dinosauria, as defined in the present paper. The genus Plateosaurus (Zanclodon), which is
. The dinosaurs of North America. Dinosaurs. MARSH.] 235 during the life of the animal, an essential part of the remarkable leap- ing foot to which it belonged, and in which it has since kept its posi- tion undisturbed. The presence of such an element in the foot of this diminutive dinosaur certainly suggests that the group Hallopoda, which the writer has here considered a suborder, stands somewhat apart from the typical Theropoda, but not far enough away to be excluded from the subclass Dinosauria, as defined in the present paper. The genus Plateosaurus (Zanclodon), which is from essentially the. Fig. 63.—Pelvis of Morosaunts lentus Marsh; seen from the left. a, acetabular opening; other letters as in fig. G2. One-eighth natural size. same geological horizon in Germany as Aetosaurus and Belodon, is one of the oldest true dinosaurs known, and a typical member of the order Theropoda. In the pelvic arch of this reptile the ilium and ischium are in type quite characteristic of the group to which it belongs, but the pubic elements are unique. They consist of a pair of broad, thin plates united together so as to form an apron-like shield in front, quite unlike anything known in other dinosaurs. The wide pubic bones of Belodon, and the corresponding plates in some of the Sauropoda (Moro- saurus, fig. 63). indicate that this feature of the reptilian pelvis may. 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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