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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
J10R0SAURID.E. 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
Text Appearing After Image:
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 PI.. 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

Note About Images