. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. Wiim-h-Bp. FIG. 39.—PORTIONS OF THE VERTEBRAL COLUMN OF Scyllhun (From Parker's Practical Zooloyy.) A and B, from the trunk ; C and /), from the middle of the tail; A and C, two vertebrae in longitudinal section ; B and D, single vertebrae viewed from one end ; b, calcined portion of centrum ; c, centrum ; for, foramen for dorsal, and for', for ventral root of spinal nerve; , haemal arch (basi-ventral); , ha-mal canal; h.*p, haemal spine; , intercalary piece (interdorsal, or interneural plate) ; ,
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. Wiim-h-Bp. FIG. 39.—PORTIONS OF THE VERTEBRAL COLUMN OF Scyllhun (From Parker's Practical Zooloyy.) A and B, from the trunk ; C and /), from the middle of the tail; A and C, two vertebrae in longitudinal section ; B and D, single vertebrae viewed from one end ; b, calcined portion of centrum ; c, centrum ; for, foramen for dorsal, and for', for ventral root of spinal nerve; , haemal arch (basi-ventral); , ha-mal canal; h.*p, haemal spine; , intercalary piece (interdorsal, or interneural plate) ; , neural arch ; , neural canal; n.}), neural plate (basi-dorsal); n.*p, neural spine ; nt<-, intervertebral substance (remains of notochord); r, proximal portion of rib; , transverse process (basal stump). pairs of supradorsals, however, persist and remain unossified in Lepidosteus (Fig. 42), and in the caudal region of Amia the basi- dorsals and basiventrals remain separate from the interdorsals and interventrals, thus giving rise to double vertebral bodies (pre- centra, bearing the arches, and archless postcentra}. A somewhat similar condition is seen in the Jurassic Eurycormus and other fossil Ganoids. From what has been said above, it will be seen that the number of arch elements does not necessarily correspond 1 It was mentioned on p. 48 that in the Lamprey there are two pairs of arcualia to each myotome : it is possible that they correspond to alternating basidorsals and 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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