. Bulletin - United States National Museum. Science. b. Figure 60.—Views of second caudal, USNM 16567, of Diorocetus hiatus: a, anterior view; b, lateral view. Abbrs.: mp., meta- pophysis; tr., transverse process. in the other series (USNM 16567); the remaining epiphyses were detached. At the anterior end of the caudal series, the centra are relatively massive as contrasted with the posterior lumbars, but are progressively shortened from the second to eighth; the neural spine and the neural canal diminish in height from the second to the eighth; the interval between the dorsal edges of the opp
. Bulletin - United States National Museum. Science. b. Figure 60.—Views of second caudal, USNM 16567, of Diorocetus hiatus: a, anterior view; b, lateral view. Abbrs.: mp., meta- pophysis; tr., transverse process. in the other series (USNM 16567); the remaining epiphyses were detached. At the anterior end of the caudal series, the centra are relatively massive as contrasted with the posterior lumbars, but are progressively shortened from the second to eighth; the neural spine and the neural canal diminish in height from the second to the eighth; the interval between the dorsal edges of the opposite metapophyses progressively increases from the second to the sixth or seventh; and the horizontally outward directed transverse processes become reduced gradually to a flange-like process on the seventh caudal. On the centrum of the posteriormost lumbar (USNM 23494) there is a single sharply defined median longitudinal ventral ridge; this ridge is replaced by a pair of parallel ridges on the first caudal. The width of the median ventral longitudinal haemal groove between the haemal tubercles (hypapophyses) increases gradually to the fourth or fifth caudal (USNM 16567). The anterior pair of haemal tubercles are not developed on the three anterior caudals. The posterior pair of haemal tubercles increases in size from the third to the sLxth; concomitantly the distance between the anterior and the posterior tubercles on each side is decreased. These posterior haemal tubercles certainly are attached to the chevron bone on the third caudal. On the third, fourth, and fifth caudals, the oblique upward course of the segmental blood vessels from the haemal groove to the anterior basal edge of the transverse process and thence to the posterior end of the neural canal is indicated by a faint shallow groove. This groove becomes more distinct on the left side of the sixth caudal; the blood vessels perforate the reduced transverse process on the right side of the sixth, both sides on t
Size: 1267px × 1973px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
