180 Sex-Reversal in Frogs and/ Toads 



long strip of fat within which was an elongated organ with the appearance of an 

 immature ovary and enclosing a typical oviduct. On histological examination the 

 organ proved to be an ovary consisting mainly of young oocytes. 



" Knowing the previous history of the animal there can be no doubt that we 

 have here a case of complete sex-reversal." 



Champy has not yet bred from such a feminised male. 



BIBLIOGRAPHY. 



1. BouLANG^, H. "Un cas d'hermaphroditisme vrai bilateral chez Rana fusca 



(Thomas)." Feuille des Jeunes Naturalistes, Tom. xliv. p. 79. Paris, 1914. 



2. Bourne, A. G. " On Certain Abnormalities in the Common Frog." Q. J. M. S. 



Vol. XXIV. p. 83, 1884. 



3. Cerruti, a. " Contribvizioni per lo studio dell organo di Bidder nei Bufonidi. 



I. Di una speciale penetrazione di ovuli in ovuli nel Bufo vulg. Laur." Attr 



R. Sc.Jis. mat. Vol. xii. ser. 2, No. 1, pp. 1—8. Napoli, 1903. 

 4. . "II. Presenzadispermii neir organo." Btdl. Sci.Nat.\d\..x\i\.\)\t.\bO—b. 



Napoli, 1903. 

 5. . " Sopra due casi di anomalia dell' apparato reproduttore nel Biifo vulg. 



Laur," Anat. Am. Bd. xxx. p. 453, 1907. 



6. Chapin, C. L. "A Microscopic Study of the reproductive system of foetal 



free-martins." Journ. Exfer. Zool. Vol. xxiii. p. 453, 1917. 



7. Cole, F. "A case of Hermaphroditism in Rami temporaria." Anat. Anz. Bd. xi. 



p. 112, 1895. 



8. Crew, F. A. E. " A Description of certain Abnormalities of the Reproductive 



System found in Frogs and a Suggestion as to their Possible Significance." 

 Proc. Roy. Phys. Soc. Edin. Vol. xx. Part 5, p. 236, 1921. 



9. Cutler, D. W. and Doncaster, L. "The Sterility of the Tortoiseshell Tom- 



cat." Journal of Genetics., Vol. v. p. 65, 1915. 



10. Doncaster, L. " The Tortoiseshell Tom-cat, — a Suggestion." Journal of 



Genetics, Vol. ix. p. 335, 1920. 



11. Gerhartz, H. " Rudimentarer Hermaphroditismus bei /iawa escM^ento." 2irch. 



f mikr. Anat. Bd. Lxv. p. 669, 1905. 



12. GoLDSCHMiDT, R. Mechanismus u. Physiologic der Geschlechtsbestimmimg. 



Berlin, 1920. 



13. Harms, W. Experimentelle Untersuchungen Uber die innere Sekretion der Keini- 



drilsen. Jena, 1914. 



14. Hooker, D. "Der Hermaphroditismus bei Froschen." Arch, f mikr. Anat. 



Bd. Lxxix. p. 181, 1912. 



15. Huxley, J. S. " Note on an Alternating Preponderance of Males and Females 



in Fish and its Possible Significance." Jmwnal of Genetics., Vol. x. No. 4, 

 1920. 



16. Kent, A. F. S. "A Case of Abnormal Development of the Reproductive Organs 



in the Frog." Journ. Anat. and Phys. Vol. xix. p. 129, 1885. 



17. King, H. D. "Some Abnormalities in the Genital Organs oi Bufo lentiginosus 



and their Probable Significance." Amer. Journ. Anat. Vol. x. p. 159, 1910. 



18. Knappe, E. "Das Biddersche Organ." Morph. Jahrb. Bd. xi. pp. 489 — 548, 



1886. 



