. Bulletin - United States National Museum. Science. 142 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. a while, on the other hawi, the teeth of Friconodon are much larger than those of the stegosaur. Leidy says, however, that "we observe no necessary relation to the length of animals in proportion with the size of their ; The diniensions of the centrum are as follows: min. Length (i9. 0 Depth of anterior face 49. 0 Depth of posterior face 60. 0 Width of anterior face 37. 3 Width of posterior face 49. 5 Depth of posterior concavity .'. , 9. 5 Least width of arch facet (ant.) '...
. Bulletin - United States National Museum. Science. 142 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. a while, on the other hawi, the teeth of Friconodon are much larger than those of the stegosaur. Leidy says, however, that "we observe no necessary relation to the length of animals in proportion with the size of their ; The diniensions of the centrum are as follows: min. Length (i9. 0 Depth of anterior face 49. 0 Depth of posterior face 60. 0 Width of anterior face 37. 3 Width of posterior face 49. 5 Depth of posterior concavity .'. , 9. 5 Least width of arch facet (ant.) '...â .. 17. 0 Greatest width of arch facet {post) : 33. 2 The vertebra is nearest to Stegosaurus, but the. equivalent vertebra of Paloeoscincus is unknown, and the association of vertebrae and teeth is in each case conjectural. The tapering centrum with flattened articular end, with a surface, although badly worn, highly suggestive of sutural roughening, apparently indicates it to belong either to the sacrum or in contact with it. Certainly it does not belong to the mid-dorsal region as determined by Lull. Compared with the sacral centra of OrnifJiomimus sedens, figure 67 suggests it to belong to the vertebra immediately preceding sacral 1 of that specinien, for the reason that sacral 1 has a flattened, rugose, anterior articular end, and from the fact that the present readily distinguished from the other centra of this sacral series. Unfortunately, the cen- trum preceding the first sacral in the type of 0. sedens is missing, as it is also in the Ornithomimus skeleton (pi. 35, fig. 2) in the American Museum of Natural History, so that a direct comparison can not be made at this time. Compared with the posterior dorsal vertebra of Ormthomimus alius, figured by Lambe (fig. 1, pi. 13, Contrib. to Canadian Paleontology, vol. 3, pt. ,2, 1902), such general resemblances were found in the outlines of the centra as to apparently show the correctness of the present provision
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