. Bulletin - United States National Museum. Science. 134 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. (figs Proceeding posteriorly the spinous processes of the caudals suffer a very rapid reduction in their height (pi. 35, fig. 1), the twelfth being about one-fourth the height of the first. Both the anterior and posterior borders of these processes are vertically grooved, the bottoms of the grooves being roughened for the attachment of ligaments 68 and 69). The tops of all of the processes are squarely truncated, and without transverse thickening ex- A > p cept on the front and pos- terior
. Bulletin - United States National Museum. Science. 134 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. (figs Proceeding posteriorly the spinous processes of the caudals suffer a very rapid reduction in their height (pi. 35, fig. 1), the twelfth being about one-fourth the height of the first. Both the anterior and posterior borders of these processes are vertically grooved, the bottoms of the grooves being roughened for the attachment of ligaments 68 and 69). The tops of all of the processes are squarely truncated, and without transverse thickening ex- A > p cept on the front and pos- terior margins, the medi- an portion presenting an acutely edged border, es- pecially pronounced in this respect, posterior to the eighth. The transverse proc- esses are especially broad anteroposteriorly and placed well down on the sides of the neural arch. The first of the series are slightly elevated above the horizontal, but pro- FlG. 68.âFirst CAUDAL VERTEBRA OF OKNlTUOMlMLSStlJKNS JIARSH. TYPE, NO. 4736 CCeUing baCKWarCl thCy , J NAT. SIZE. A, VIEWED FB )M THE RIQHT SIDE; B, VIEWED FROM THE JTradUallV aSSUmC 3 fiorl- ANTERIOR end; i, DLiPOPHYSIS; «, SPINE; JU, SUTURE BETWEEN CENTRUM ^ . J <; 11 â , AND SPINOUS process; 2, ANTERIOR ZYGAPOPHTSIS; Z', POSTERIOR ;OPHYSIS. ZOntal, anU lUially lU XlVQ most posterior ones are depressed below the horizontal. Marsh has pointed out the diplosphenal articulation of the caudal vertebrae and also that the first caudal bears a chevron, the longest of the series, as in Ornithomimus alius. Osborn' describes the chevron of the latter as "elongate and ; The close resemblance. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washing
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