. Amphioxus and the ancestry of the vertebrates. Amphioxus; Sea squirts; Hemichordata. LARVAL DEVELOPMENT. 151 Development of Reprodjictive Organs. One of the most interesting events which we have now to chronicle is the development of the reproductive organs. This commences when the young Amphioxus has reached the length of about 5 ram. Our knowledge of the details of the processes involved in the formation of the genital organs is again due to the work of BovERr, who has made the discovery that the. met Fig. 85. — Transverse section through the pharyngeal region of a young individual of 5 mm

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. Amphioxus and the ancestry of the vertebrates. Amphioxus; Sea squirts; Hemichordata. LARVAL DEVELOPMENT. 151 Development of Reprodjictive Organs. One of the most interesting events which we have now to chronicle is the development of the reproductive organs. This commences when the young Amphioxus has reached the length of about 5 ram. Our knowledge of the details of the processes involved in the formation of the genital organs is again due to the work of BovERr, who has made the discovery that the. met Fig. 85. — Transverse section through the pharyngeal region of a young individual of 5 mm., to show place of origin of se.xual elements. (After BovERI.) f. Fascia, e.c. Portion of ccelom, which will form the endostylar ccelom. Kg. Primitive sexual cells in the lower angle of the myoccel. Other letters as above. primitive sexual cells arise in the cavity of the myotome by differentiation of certain of the epithelial cells lining the myoccel. It had previously been assumed that they were derivatives. 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 work.. Willey, Arthur, 1867-. New York, London, Macmillan

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