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“Portion of a similar embryo at a later stage of growth. The praegenital somite, VII PrG, is still present, but has lost its rudimentary appendages; go, the genital operculum, left half; KM, the left pecten; abp4 to abp7, the rudimentary appendages of the lung-sacs.” — The Encyclopedia Britannica, 1910


The Encyclopedia Britannica, Eleventh Edition (New York: The Encyclopedia Britannica Company, 1910)II:293


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