. Bulletin - United States National Museum. Science. OSTEOLOGY OF CARNIVOKOUS DINOSAURS. 101 /â --) The anterior chevrons ot^Ceratosaurus are especially long, slender, and with but slight backward curve. They articulate intervertebraUy with beveled articular facets on the ends of,'theT,centra. They begin between the first and second vertebrae and continue to the forty-first caudal. The second, the longest one of the series, measures 254 mm. in length. The haemal opening between the branches forming the Y-shaped proximal ends are very much constricted trans- versely. The proximal end is very sl
. Bulletin - United States National Museum. Science. OSTEOLOGY OF CARNIVOKOUS DINOSAURS. 101 /â --) The anterior chevrons ot^Ceratosaurus are especially long, slender, and with but slight backward curve. They articulate intervertebraUy with beveled articular facets on the ends of,'theT,centra. They begin between the first and second vertebrae and continue to the forty-first caudal. The second, the longest one of the series, measures 254 mm. in length. The haemal opening between the branches forming the Y-shaped proximal ends are very much constricted trans- versely. The proximal end is very slightly expanded, but it ,' forms a bridge across the upper j boimdary of the haemal open- \ ing. These chevron bones of Ceratosaurus can be readily dis- tinguished from the homolo- gous elements of other American Theropodous dinosaurs by their greater relative length and slenderness, and by the very sUght exjiansion of their proxi- mal and distal ends. The distal series are short, with expanded free ends that curve decidedly backward. Chevrons 29 to 34, viewed from the side, show a spur-like pro- longation that extends well up- ward between the two centra. In a lesser degree the anterior chevrons of Tijrannosaurus ' have a somewhat similar devel- opment, as they do also in Gor- gOSaurUS hbratUS ^j^, ,53 _LEfT fore limb and foot of ceratosaurus nasicornis Maesh. jjjgg Cat. No. 4735, Type. About J NAT. size. Viewed FROM THE front. GREATER PART OF THE CORACOID, DISTAL END OF TJlOTOcic ribs. The thoracic scapula, humerus, carpus, and terminal phalanges of Ceratosau- . f /~i 4 ^^^ UNKNOWN. These are restored here from allied forms. ribs 01 CeVQtOSdUTUS are un- this figure was first published by Marsh as the fore limb of known at this time, except the allosaurus feagius. (after marsh.) right articulating with presacral Xo. 21, shown as found in position in plate 21, figures 1 and 2. ' Osbom, H. F. Bull. Amer. Mus. Nat. Hist., vol. 35,1917, pi. 27. » Lambe, M
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