ment of the Kidney, and the Development of the - Journal of Cell ...

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470 PETER GRAY efferentia; (b) an anterior prolongation connecting the anterior end of the gonad to the anterior end of the kidney. (Text-fig. 3, B, G.) 14. The rudimentary vasa efferentia ends in a mass of blastema lying along the edge of the kidney. 15. This mass, from which Bidder's canal subsequently develops, is itself connected to the abortive unit which terminates the straight tubules. (Figs. 9 a and b, PI. 21, Fig. 4, PI. 20.) 16. The anterior prolongation ends in a mass of kidney tubules at the anterior end of the kidney. (Fig. 8, PI. 21.) 17. It is suggested that these anterior units are without functional significance. 18. The testis end of the anterior prolongation grows downwards into the testis and becomes connected to the tubules and vasa efferentia. (Text-fig. 3, D.) 19. The kidney connexions of the vasa efferentia remain unaltered but the anterior prolongation degenerates (Text-fig. 3, E.) The Development of the Seminal Vesicles. 20. In a four-legged tadpole there is a mass of mesenchyme, containing aggregations of kidney blastema, on the side of the archinephric duct between the points where this leaves the kidney and enters the rectum. (Fig. 26, PL 23.) 21. The mesenchyme forms connective tissue and the blastema aggregations form short tubules. 22. During the third year after metamorphosis these tubules branch and coil. 23. It is emphasized that the seminal vesicle derives nothing from the archinephric duct, and suggested that it may represent the remnants of the most posterior units of the sexual kidney. Review. 24. The author's views on the relationships of the various units found in the developing kidney of Eana are expressed in tabular form on pp. 467 and 468.
DEVELOPMENT OF AMPHIBIAN KIDNEY 471 G. BIBLIOGRAPHY Beissner, H. (1898).—"Bau der samenableitenden Wege bei Rana fusca und Rana esculenta", 'Arch. f. mikr. Anat.', 53. Bidder, F. H. (1846).—" Vergleichende anat. u. histol. Unters. iiber die mannlichen Geschlechts- und Harnwerkzeuge der nackten Amphibien", ' Dorpat'. [Seen only in abstract.] Frankl, 0. (1897).—"Ausfuhrwege der Harnsamenniere des Frosches", 'Zeit. wiss. Zool.', 63. Gaupp, E. (1904).—"Ecker's und Wiedersheiin's 'Anatomie des Frosches'. 3te Abt., 2te Auflage". Gerhartz, H. (1905).—"Anatomie und Physiologie der samenableitenden Wege der Batrachier", 'Arch. f. mikr. Anat.' 65. Gray, P. (1930).—" Development of Amphibian Kidney. Parti. Development of Mesonephros of Rana temporaria", 'Quart. Journ. Mic. Soi.% 73. (1932).—"Development of Amphibian Kidney. Part II. Development of Kidney of Triton vulgaris, comparison with Rana", ibid., 75. Hall, R. W. (1904).—"Development of Mesonephros and Miilleriaii Ducts in Amphibia", 'Bui. Mus. Comp. Zool. Harvard', 45. Hoffman, C. K. (1886).—"Zur Entwickelungsgeschichte der Urogenitalorgane bei den Anamnia", 'Zeit. wiss. Zool.', 44. Kuschakewitsch, S. (1910).—"Entwickelungsgeschichte der Keimdrusen von Rana esculenta", 'Festsch. f. R. Hertwig'. Lloyd, J. H. (1928).—"Urogenital Organs of Male Frog", 'Nature', 121. London. MacBride, E. W. (1892).—"Development of Oviduct in Frog", 'Quart. Journ. Micr. Sci.', 33. Nussbaum, N. (1880).—"Entwickelungsgeschichte d. samenableitenden Wege b. d. Anuren", 'Zool. Anz.', 3. (1886).—"Bau und Thatigkeit der Driisen", 'Arch. f. mikr. Anat.' (1912).—"Bau und Thatigkeit der Driisen. Bau und cyclische Veranderungen der Samenblasen von Rana fusca", ibid., 80. Semon, R. (1890).—"Morphol. Bedeutung der Vorniere in ihrem Verhaltniss z. Vorniere u. Nebenniere u. iiber ihre Verbindung mit dem Genitalsystem", 'Ant. Anz.', 5. Spengel, J. (1876).—"Das Urogenitalsystem der Amphibien", 'Arb. zool.- zoot. Inst., Wiirzburg', 3. Stewart, S. G. (1927).—"Structure of Frog's Kidney", 'Anat. Rec.\ 36. Philadelphia. Swingle, W. W. (1925).—"Germ Cells of Anurans. II. Embryological study of sex-differentiation in Rana catesbiana", 'Jour. Morph.', 41. Van Oordt, G. J. (1922).— "Morphology of Testis of Rana fusca", 'Proc. Kon. Akad., Amsterdam', 25. Witschi, E. (1914).—" Experimentelle Untersuch. iiber die Entwickelungsgeschichte von Rana temporaria", 'Arch. f. Mikr. Anat.', 85.
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