. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 68. 40 Fig. 12. Shape of selected trunk and caudal vertebrae in Amia calva (339 mm SL). 78 (Tables 10-12), which are always present on the succeeding centra and progressively become longer until the twelfth (Fig. 12). The basapophyses are approximately the same length between the twelfth and tlie thirty-second centra, from which point they begin to diminish gradually in length until the last trunk centrum, where they coalesce with the aortal facets. The lengths of the basapo- physes were not individuall
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 68. 40 Fig. 12. Shape of selected trunk and caudal vertebrae in Amia calva (339 mm SL). 78 (Tables 10-12), which are always present on the succeeding centra and progressively become longer until the twelfth (Fig. 12). The basapophyses are approximately the same length between the twelfth and tlie thirty-second centra, from which point they begin to diminish gradually in length until the last trunk centrum, where they coalesce with the aortal facets. The lengths of the basapo- physes were not individually measured; this data would be of little practical use in a comparison of Recent and fossil material since these relatively fragile structures are rarely preserved intact in fossils. The distal end of each basapophysis is attached to a pleural rib by means of cartilage. The proximal ends of the basapophyses are ankylosed to the ventral half of the verte- bral body. These paired processes are solid cyHnders (hollow at the tips) that are slightly Battened dorsoventrally. Each pair of basapophyses may not always be of equal length or diameter, but they are extremely regular in position. They form two con- tinuous and symmetrical lines that gradu- ally come closer together until the last trunk centrum, where they are separated only by aortal supports. An important aspect of the basapophyses in A. calva is the angle between each indi- vidual pair which gradually decreases pos- teriorly. Since the angl(> ])etween the basapophyses is generally still available in. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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