. Chordate morphology. Morphology (Animals); Chordata. animal pole sperm entrance. penetration path animal pole limit of involution gray crescent (dashed outline) dorsal blastopore lip. 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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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity