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1“... of the oesophageal opening. The oesophagus is relatively long and narrow, and runs back to the oval thin walled...”
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2“... of the oesophageal opening. The oesophagus is relatively long and narrow, and runs back to the oval thin walled...”
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3“... particles escaping into the intestine. In B. stellifer this posterior chamber has thin walls and is much...”
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4“... particles escaping into the intestine. In B. stellifer this posterior chamber has thin walls and is much...”
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