. Diplodocus (Marsh) : its osteology, taxonomy, and probable habits, with a restoration of the skeleton. Diplodocus. 20 MEMOIRS OF THE CARNEGIE MUSEUM ward. Tliero are prominent rugosities just above the postzygapophyses. There is a prominent transverse process springing from tlie middle of the sides of the neural arch. It is broad and thin and is directed downward, backward and outward, and terminates inferiorly in a small spatulate ex23ansion. The posterior blade of the horizontal lamina extends from the transverse process to the posterior zygapo- physis at an ascending angle of 45°. The inf
. Diplodocus (Marsh) : its osteology, taxonomy, and probable habits, with a restoration of the skeleton. Diplodocus. 20 MEMOIRS OF THE CARNEGIE MUSEUM ward. Tliero are prominent rugosities just above the postzygapophyses. There is a prominent transverse process springing from tlie middle of the sides of the neural arch. It is broad and thin and is directed downward, backward and outward, and terminates inferiorly in a small spatulate ex23ansion. The posterior blade of the horizontal lamina extends from the transverse process to the posterior zygapo- physis at an ascending angle of 45°. The inferior blade of the diapophysial lamina has a horizontal position and supports the posteriorly projected transverse process by forming a short laminar buttress connecting that process with the sides of the neural arch and separating the infradiapophysial cavity from the postdiapophysial cavity. This latter cavity is separated from the supradiapophysial cavity by the posterior blade of the horizontal lamina. There is no prediapophysial cavity in the axis. A short cervical rib without anterior process springs from the side of the centrum near its inferior margin and anterior extremity. Only the base of the odontoid process is preserved, but this indicates that it was of moderate length, with a slightly concave superior surface. The centrum is strongly opisthoccclous, as is the case also in all the succeeding cervicals and anterior dorsals. The central artic- ulations of the cervicals and anterior dorsals of Dijilodocus are the most finished of all the articular surfaces in the entire skeleton. There are deep pleuro-central cavities which extend anteriorly into the base of the odontoid process. Posteriorly these cavities are only sej^arated from the cup for the ball of the succeeding vertebra by a thin plate of bone. Thus the body of the centrum is practically destroyed, and instead of consisting of a solid bony cylinder it is reduced to four thin plates. These unite to form the m
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdiplodo, bookyear1901
