. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 3. H. tucki. Stereophotograph of main matrix block, left side. Scale = 5 cm. longer neurocentral junctions (10-11 mm) and more widely separated pre- and postzygapophyses. Each centrum has a moderate ventral keel, concave in lateral outline, which is not strongly differentiated from the centrum itself. The axis has a rather more elongate centrum with a less marked lateral concavity and ventral keel than the other anterior cervicals. The odontoid process is 7,5 mm long. C6-9 have shorter centra, n
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Fig. 3. H. tucki. Stereophotograph of main matrix block, left side. Scale = 5 cm. longer neurocentral junctions (10-11 mm) and more widely separated pre- and postzygapophyses. Each centrum has a moderate ventral keel, concave in lateral outline, which is not strongly differentiated from the centrum itself. The axis has a rather more elongate centrum with a less marked lateral concavity and ventral keel than the other anterior cervicals. The odontoid process is 7,5 mm long. C6-9 have shorter centra, narrower neurocentral junctions (decreasing from 8 mm in C6 to 5 mm in C9), more closely apposed pre- and post- zygapophyses and much more strongly developed diapophyseal processes. The keeling and concave ventral outline are more pronounced in C6-9. Furthermore, a ridge outlines the anterior and posterior intercentral margins. The anterior ridge continues up the side of the centrum and joins the parapophyseal promi- nence. The posterior ridge continues along the ventral margin of the centrum. These ridges outline a much deeper concavity below the parapophyses in C6-9 than in C2-5. They also increase the transverse width of the ventral keel which is narrow and sharp in C2-5, but flat and several millimetres wide in C6-9. While some of these distinctions typify the cervical vertebrae of other orni- thischians ( Hypsilophodon), the division into two groups is more pronounced in H. 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 African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
