. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 8. Plate arrangement of lower part of cup in monocyclic camerate crinoids showing inferred correlation with thecal elements of eocrinoids and rhombiferan cystoids as differentiated in Figures 1-5. A, Glyptoerinina, ; B, Tanaocrinidae, ; C, Actinocrinitidae, ; D, Plan of basal circlet in all families of Tanaocrinina except Tanaocrinidae, Dichocrinidae, and Acrocrinidae, showing orientation of pentastellate lumen and (by dotted lines) position of sutures between plates in a 5-plate circ
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. 8. Plate arrangement of lower part of cup in monocyclic camerate crinoids showing inferred correlation with thecal elements of eocrinoids and rhombiferan cystoids as differentiated in Figures 1-5. A, Glyptoerinina, ; B, Tanaocrinidae, ; C, Actinocrinitidae, ; D, Plan of basal circlet in all families of Tanaocrinina except Tanaocrinidae, Dichocrinidae, and Acrocrinidae, showing orientation of pentastellate lumen and (by dotted lines) position of sutures between plates in a 5-plate circlet. If derivation here suggested is correct, the brachials of each ray are de- veloped in series with plates corresponding to infralaterals of eocrinoids and rhombiferan cystoids; also, the ancestral stock that gave rise to the Tanao- crinina (Figs. B-D) must have developed the hexameral organization of caryocrinitids, whereas the Glyptoerinina descended from a normal penta- meral type of 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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