SEX-RATIOS IX GAMBUSIA HOLBROOKI. 207 



Weyenbergh, H. 



'72 Bijdrage tot de kennis van het vissengeslacht Xiphophorus Heck. 



Versl. Akad. Wet. Amsterdam. Wis. Nat. Afd., Tweede Ser.. Vol. 



8, pp. 291-308. 

 Winge, O. 



*22a A Peculiar Mode of Inheritance and its Cytological Explanation. 



Jour. Genetics, Vol. 12, pp. 137-144. 

 J 22b One-sided Masculine and Sex-linked Inheritance in Lebistes reticula- 



tns. Ibid., Vol. 12, pp. 145-162. 

 Wodsedalek, J. E. 



'20 Studies on the Cells of Cattle, with Special Reference to Spermato- 



genesis, Ob'gonia, and Sex-determination. BIOL. BULL., Vol. 3*?, pp. 



290-317. 

 Woltereck, R. 



'08 Geschlechtsbestimmung bei Warmwasser-Fischen. Internat. Rev. d. ges. 



Hydrobiol. und Hydrogr., Bd. i, S. 519-531. 

 Zeleny, C., and Faust, E. C. 



'153. Size Dimorphism in the Spermatozoa from Single Testes. Jl. Exp. 



Zool., Vol 18, pp. 187-240. 

 'i5b Variation in Length of Spermatozoa in Seven Additional Species of 



Insects. Ibid., Vol. 19, pp. 505514. 



