804 



THE EXCRETORY AND REPRODUCTIVE SYSTEMS 



Felix, W. 1906. Chap. 2, Part 111, in Ver- 

 gieichenden und Experimentellen Ent- 

 wickelungslehre der Wirbeitiere by O. 

 Hertwig. Gustav Fischer, Jena. 



. 1912. Chap. 19 in Human Em- 



bryology by F. Keibel and F. P. Mall. 

 J. B. Lippincott Co., Philadelphia. 



Field, H. H. 1891. The development of 



the pronephros and segmental duct in 



Amphibia. Bull. Mus. Comp. Zool. at 

 Harvard College. 21:201. 



Goodrich, E. S. 1930. Studies on the Struc- 

 ture and Development of Vertebrates. 

 Macmillan and Co., London. 



Gruenwald, P. 1937. Zur Entwicklungs- 

 mechanik des urogenitalsystems beim 

 Huhn. Arch. f. Entwicklngsmech. d. 

 Organ. 136:786. 



. 1939. The mechanism of kidney 



development in human embryos as re- 

 vealed by an early stage in the agenesis 

 of the ureteric buds. Anat. Rec. 75:237. 



. 1941. The relation of the grow- 

 ing Mullerian duct to the Wolffian duct 

 and its importance for the genesis of 

 malformations. Anat. Rec. 81:1. 



Hamburger, V. and Hamilton, H. L. A se- 

 ries of normal stages in the development 

 of the chick embryo. J. Morph. 88:49. 



Howland, R. B. 1916. On the effect of re- 

 moval of the pronephros of the amphib- 

 ian embryo. Proc. Nat. Acad. Sc. 2:231. 



. 1921. Experiments on the effect of 



removal of the pronephros of Amblys- 

 toma punctatum. J. Exper. Zool. 32:355. 



Kerr, J. G. 1919. Textbook of Embryol- 

 ogy, Vol. II, Vertebrata with the Excep- 

 tion of Mammalia. Macmillan Co., Ltd., 

 London. 



Kingsbury, B. F. 1938. The postpartum 

 formation of egg cells in the cat. J. 

 Morphol. 63:397. 



Lillie. F. R. 1930. The Development of 

 the Chick. Henry Holt & Co., New York. 



Nelsen, O. E. and Swain, E. 1942. The 

 prepubertal origin of germ cells in the 

 ovary of the opossum (Didelpliys vir- 

 giniana). J. Morphol. 71:335. 



Price, G. C. 1896. Development of the 

 excretory organs of a myxinoid, Bdello- 

 stoma stouti Lochington. Zool. Jahrb. 

 Anat. u. Ontogenic. 10:205. 



Scammon, R. E. 1911. Normal plates of 

 the development of Squalus acanthias. 

 Chap. 12 in Normentafeln zur Entwick- 

 lungsgeschichte der Wirbeitiere von F. 

 Keibel. G. Fischer, Jena. 



Swift, C. H. 1916. Origin of the sex cords 

 and definitive spermatogonia in the male 

 chick. Am. J. Anat. 20:375. 



Swingle, W. W. 1919. On the experimental 

 production of edema by nephrectomy. J. 

 Gen. Physiol. 1:509. 



Witschi, E. 1921. Development of gonads 

 and transformation of sex in the frog. 

 Am. Nat. 55:529. 



. 1929. Studies on sex differentia- 



tion and sex determination in amphib- 

 ians. I. Development and sexual differ- 

 entiation of the gonads of Rana sylvatica. 

 J. Exper. Zool. 52:235. 



