. A Preliminary Account of the Development of the Free-Swimming Nauplius of Leptodora hyalina (Lillj.) . .Mesodernd&sQ--Band. B. 5~~S i. 4.—A. Longitudinal vertical section through the dorso-lafceml swelling ; it i>taken at some distance from the mid-dorsal line (see fig. 2).B, Similar section taken elose to the mid-dorsal line. End S&,. Upper Lip. B. A. i. 5.—A. Obliquely transverse section through the dorso-lateral swelling of nmetananplius. The maxillary gland lias become sharply differentiated fromthe imbeddiug octoderm. B. Similar section through an older metanauplius; the space marked

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. A Preliminary Account of the Development of the Free-Swimming Nauplius of Leptodora hyalina (Lillj.) . .Mesodernd&sQ--Band. B. 5~~S i. 4.—A. Longitudinal vertical section through the dorso-lafceml swelling ; it i>taken at some distance from the mid-dorsal line (see fig. 2).B, Similar section taken elose to the mid-dorsal line. End S&,. Upper Lip. B. A. i. 5.—A. Obliquely transverse section through the dorso-lateral swelling of nmetananplius. The maxillary gland lias become sharply differentiated fromthe imbeddiug octoderm. B. Similar section through an older metanauplius; the space marked f hasdeveloped. The space * will soon become continuous with the space aroundthe heart.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectproceed, bookyear1901