. Bulletin - United States National Museum. Science. a Figure 70.—Views of twelfth caudal, USNM 16567, of Diorocetus hiatus: a, posterior view; b, lateral view. end of the series possess a ventral haemal spine of varying shape, but diminishing in vertical diameter behind the second or third. These chevrons (pi. 57, figs. 9-11) have a Y profile when viewed from in front, and have definitely developed articular facets on the horizontally widened dorsal ends of the lateral lamina. Judging from the width of the interval separating the opposite articular surfaces on the base of the lateral lamina,
. Bulletin - United States National Museum. Science. a Figure 70.—Views of twelfth caudal, USNM 16567, of Diorocetus hiatus: a, posterior view; b, lateral view. end of the series possess a ventral haemal spine of varying shape, but diminishing in vertical diameter behind the second or third. These chevrons (pi. 57, figs. 9-11) have a Y profile when viewed from in front, and have definitely developed articular facets on the horizontally widened dorsal ends of the lateral lamina. Judging from the width of the interval separating the opposite articular surfaces on the base of the lateral lamina, the three largest chevrons were attached at the anterior end of the caudal series since they articulate with the paired posterior haemal tubercles of equivalent separation. The largest chevron (USNM 23494) has a wide haemal spine, the anteroposterior diameter at the extremity being equivalent to about two thirds of its vertical diameter; USNM 16567-Caudal Vertebrae Anteroposterior diameter of centrum Transverse diameter of centrum, anteriorly Tip of neural spine to ventral face of centrum Minimum anteroposterior length of pedicle neural arch Transverse diameter of neural canal anteriorly Distance between ends of transverse processes Dorsal edge of metapophysis to ventral face of centrum, including haemapophysis 136 139 120+P 114+" 128 92+" 88 56 40 117 120 118 119 120 120 121 101 94 82 77 212 + 241 200+ 169 + 169+ 153 + 127 + 118 — — — 54 53 49 46 47 40 26 — — — 22 19 20 23 19 18 16 —. — 257 239 225 212 146 121 — — — — 176 — 169 163 162 — .— .— — — — » = Anterior epiphysis missing. b^Both epiphyses missing. i'=Posterior epiphysis 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 or
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