. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 166 ANNALS OF THE SOUTH AFRICAN MUSEUM. pOZ Fig. 5. H. tucki. A. Cervical vertebrae, left lateral view, atlas missing. B. Dorsal vertebrae, left lateral view. Scales = 5 cm. tubercular process (6 mm long) is only half the length of the capitular process (12 mm). The tubercular process is not divergent from but lies on the long axis of the rib shaft; the head is flattened anteroposteriorly and bony excrescences indicate a strong attachment to the diapophysis. Comparable ridges are found on the diapoph
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 166 ANNALS OF THE SOUTH AFRICAN MUSEUM. pOZ Fig. 5. H. tucki. A. Cervical vertebrae, left lateral view, atlas missing. B. Dorsal vertebrae, left lateral view. Scales = 5 cm. tubercular process (6 mm long) is only half the length of the capitular process (12 mm). The tubercular process is not divergent from but lies on the long axis of the rib shaft; the head is flattened anteroposteriorly and bony excrescences indicate a strong attachment to the diapophysis. Comparable ridges are found on the diapophyses and these are especially well developed on C8 and 9. The capitular process of C9 diverges at about 60° from the long axis of the shaft; its head is rounded and marked by a bony ridge along only the anterior margin of the articular facet. Dorsal vertebrae (Figs 1, 3, 5B) Several features of the tenth vertebra indicate that it is the first dorsal; counting thus, there are then 12 dorsal vertebrae. Most importantly, compared to C6-9, the tenth centrum is elongated and has a longer neurocentral junction; the intercentral margins are not raised into strong ridges and the ventral keeling is considerably smaller. However, the first three dorsals are, in some features, intermediate between the posterior cervicals and the remaining dorsals. The presence of a small ventral keel is an intermediate condition in that the succeeding dorsals have none. The level of the zygapophyses above the centrum decreases gradually in the first three dorsals from their position high above the centrum in the posterior cervicals (Dl, Fig. 5B) to just above the centrum in most of the other dorsals (D3/4, Fig. 5B). The angle of inclination of the zygapophyseal facets gradually. 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 South Af
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
