. Methods of study in natural history . Animals; Corals; Embryology. 218 HOMOLOGIES. ponderance of the ab-oral region determines all that peculiarity of form which distinguishes them from the other Echinodermsy while the oral region is comparatively insignificant. The ab-oral region in the Crinoid rises to form a sort of cup-like or calyx-like projection. The plates forming it, which in the Star-Fish or the Sea-Urchin are movable, are soldered together so as to be per-. Crinoid with branching crown ; oral side turned upward. fectly immovable in the Crinoid. Let this seem- ing calyx be now prol
. Methods of study in natural history . Animals; Corals; Embryology. 218 HOMOLOGIES. ponderance of the ab-oral region determines all that peculiarity of form which distinguishes them from the other Echinodermsy while the oral region is comparatively insignificant. The ab-oral region in the Crinoid rises to form a sort of cup-like or calyx-like projection. The plates forming it, which in the Star-Fish or the Sea-Urchin are movable, are soldered together so as to be per-. Crinoid with branching crown ; oral side turned upward. fectly immovable in the Crinoid. Let this seem- ing calyx be now prolonged into a stem, and we. 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 Agassiz, Louis, 1807-1873. Boston : Ticknor and Fields
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