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When the ova of the female and the sperm of the male are ripe, they fall into the atrium, pass through the gill-clefts into the fore-gut, and are ejected through the mouth. Transverse section of the lancelet, in the fore half. Above the sexual glands, at the dorsal angle of the atrium, we find the kidneys. Transverse section through the middle of the Amphioxus.
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