. Bulletin - United States National Museum. Science. 46 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. Measurements of anterior caudal vertebrae of Antrodemus valens, No. S367. Number Length at Width ante- Height ante- of center of rior end rior end vertebra. centrum. of centrum. of centrum. mm. mm. mm. 1 121 133 138 2 123 133 140 3 125 123 130 4 120 113 126 5 118 115 115 6 120 112 115 7 120 95 97 The vertebral centra are concave on the sides and below. The first caudal has a transverse rounded ventral surface, but in the succeeding caiuials as far back as the seventh, this surface is obtuse, bu
. Bulletin - United States National Museum. Science. 46 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. Measurements of anterior caudal vertebrae of Antrodemus valens, No. S367. Number Length at Width ante- Height ante- of center of rior end rior end vertebra. centrum. of centrum. of centrum. mm. mm. mm. 1 121 133 138 2 123 133 140 3 125 123 130 4 120 113 126 5 118 115 115 6 120 112 115 7 120 95 97 The vertebral centra are concave on the sides and below. The first caudal has a transverse rounded ventral surface, but in the succeeding caiuials as far back as the seventh, this surface is obtuse, but none are longitudinally grooved in this aspect as in Cerafosaurus. The articular faces of the centra are biconcave. On the anterior caudals this concavity is most pro- nounced on the anterior face, but in the mid caudal region these faces become subequal. On both ends the lower articular faces are beveled off for the chevron articulation (fig. 28 cli^.). None of the neural spines are perfectly preserved, the most perfect one is on the sixth caudal, as shown in fi^gure 28. At the base it is wide from front to back, heavy transversely, with a broken upper extremity that is beginning to widen trans- versely, thus indicating an expanded upper end. The spines are inclined strongly backward, their upper ends overhanging the posterior face of the centra. Proceeding posteriorly the spinous pro- ne. CAUDAL VERTEBRA Or . ccsses gi'ow smallcr, SO that in the mecUan caudal DEMus VALENS leidy, no. 8367, region it has been reduced to a short thin upstand- i SIZE. Viewed from the left side. ., ., ., ^â i â i mg plate oi bone without distal expansion as shown in figure 29. In Ceratosaurus the last distinct spine is on the thirty-first caudal; in Antrodemus, how- ever, they must surely have disappeared forward of that point. The diapophyses or transverse processes in the anterior region have their origin on the side of the neural arch, being directed outward,
Size: 1332px × 1875px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
