. The dinosaurs of North America. Dinosaurs. 181 2IOBOSA UBIDJE. MOKOSATJRTJS. The genus Morosaurus, the type of the family, was described by the writer in 1878, in the American Journal of Science, which contains most of the original descriptions of Sauropoda found in this country. THE SKULL. The head in this genus was very small. The posterior part of the skull resembled that in Diplodocus, but the front was much more massive. The lower jaw was especially powerful, as shown by the dentary bone figured in PI. XXX, fig. 3. This figure also shows the size and posi- tion of the tee
. The dinosaurs of North America. Dinosaurs. 181 2IOBOSA UBIDJE. MOKOSATJRTJS. The genus Morosaurus, the type of the family, was described by the writer in 1878, in the American Journal of Science, which contains most of the original descriptions of Sauropoda found in this country. THE SKULL. The head in this genus was very small. The posterior part of the skull resembled that in Diplodocus, but the front was much more massive. The lower jaw was especially powerful, as shown by the dentary bone figured in PI. XXX, fig. 3. This figure also shows the size and posi- tion of the teeth, one of which is figured in PI. XXXI, figs. 1 and 2. 31 32. YiG. 31—Anterior dorsal vertebra of Morosaurus grandis; front view. Fig. 32.—The same vertebra; side view. Tig. 33.—Traosverse section through centrum of same. All the figures are one-eighth, natural size. 6, ball ; c, cup ; rf, diapopbysis j /, cavity in centrum; m metapophysis ; n, neural canal; ns, neural suture ; z, nnteiior zygapophysis ; z\ posterior zyga- popbysis. The brain was very small. Its form and position in the skull are shown in fig. 2 of XXX. At the back of the skull there are two peculiar bones, called by the writer the postoccipital bones, which are shown in PI. XXX, fig. 1. THE VEKTEBR/E. The neck was elongated, and except the atlas all the cervical verte- br;e have deep cavities in the sides of the centra, similar to those in birds of flight. They are also strongly opisthocodous. The atlas and. 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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