. Chordate morphology. Morphology (Animals); Chordata. superior sagittal sinus superior petrosal sinus occipital sinus. postglenoid emissary vein inferior petrosal sinus (dashed lii signnoid sinus /" I vii ^internal jugular VII IX ^" A ORNITHORHYNCHUS B DIDELPHYS. 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 Jollie, Malcolm. New York, Reinhold

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