Spermatogenesis in spiders. 571 



Stevens, N. M., 1912, Further observations on supernumerary chromosomes 



and sex ratios in Diabrotica soror, ibid., Vol. 22. 

 Wagner, J., 1896, Einige Beobachtungen über die Spermatogenese bei 



den Spinnen, in: Zool. Anz., Vol. 19. 



Wallace, L. B., 1900, The accessory chromosome in the Spider, in: 

 Anat. Anz., Vol. 18. 



— , 1905, Spermatogenesis in the Spider, in: Biol. Bull., Vol. 8. 

 — , 1909, The spermatogenesis of Agalena naevia, ibid.. Vol. 17. 

 Wilson, E. B., 1905a, Studies in chromosomes. I., in: Journ. exper., 

 Zool., Vol. 2. 



— , 1905b, Studies in chromosomes, II., ibid.. Vol. 2. 



— , 1906, Studies in chromosomes. III., ibid.. Vol. 3. 



— , 1908a, Studies in chromosomes, IV., ibid.. Vol. 1. 



— , 1908b, The female chromosome groups in Syromastes and Pyrrhocoris, 

 in: Biol. Bull., Vol. 15—16. 



— , 1909, Studies in chromosomes. V., in: Journ. exper. Zool., Vol. 6. 



— , 1910, Studies in chromosomes. VI., ibid., Vol. 9. 



— , 1911a, Studies in chromosomes. VIL, in: Journ. Morphl., Vol. 22. 



— , 1911b, The sex chromosomes, in: Arch, mikrosk. Anat., Vol. 77. 



— , 1912, Studies in chromosomes. VIII., in: Journ. exper, Zool., Vol. 13. 



