DIFFERENTIATION, HEREDITY, SEX 327 



SAL A, L., Experimentelle Untersuchungen liber die Reifung und 

 Befruchtung der Eier bei Ascaris megalocephala. Arch. mikr. 

 Anat. 44. 1895. 



SCHAXEL, J., Die Eibildung der Meduse Pelagia noctiluca, etc. Festsch. 

 f. R. Hertwig. Jena. 1910. Versuch einer cytologischen 

 Analysis der Entwicklungsvorgange. I. Die Geschlechtszellen- 

 bildung und die normale Entwicklung von Arida foetida, Clap. 

 Zool. Jahrb. 34. 1912. 



SCHLEIP, W., Geschlechtsbestimmende Ursachen im Tierreich. Ergeb. 

 und Fortschr. Zool. 3. 1912. 



SCHNEIDER, K. C., (See ref. Ch. II.) 



SILVESTRI, F., Un nuovo interessantissimo caso di germinogonia (poli- 

 embrionia specifica) in un Imenottero parassita endofago con 

 particolare destino dei globuli polari e dimorphismo larvale. 

 Atti Accad. Lincei Rend. (V.) 14. 1905. 



SIXETY, R. DE, (Ref. in Ch. IV.) 



STEVENS, N. M., A Study of the Germ Cells of Certain Diptera, with 

 Reference to the Heterochromosomes and the Phenomena of 

 Synapsis. Jour. Exp. Zool. 5. 1908. Further Studies on the 

 Chromosomes of the Coleoptera. Id. 6. 1909. 



STOCKARD, C. R., The Development of artificially produced Cyclopean 

 Fish "The Magnesium Embryo.' 7 Jour. Exp. Zool. 6. 1909. 



SUTTON, W. S., On the Morphology of the Chromosome Group in 

 Brachystola magna. Biol. Bull. 4. 1902. The Chromosomes in 

 Heredity. Id. 1903. 



TEXXENT, D. H., The Dominance of Maternal or of Paternal Characters 

 in Echinoderm Hybrids. Arch. Entw.-Mech. 29. 1910. Echi- 

 noderm Hybridization. Publ. Carnegie Inst. No. 132. Washing- 

 ton. 1911. 



VERXOX, H. M., The Effect of Environment on the Development of 

 Echinoderm Larvae. An Experimental Inquiry into the Causes of 

 Variation. Phil. Trans. Roy. Soc. 186, B. 1895. Cross Fertili- 

 sation among Echinoids. Arch. Entw.-Mech. 9. 1900. 



DEVRIES, H., Intracellulare Pangenesis. Jena. 1889. 



WEISMANN, A., (See ref. Ch. I.) 



WHITMAN, C. O., The Embryology of Clepsine. Q.J.M.S. 18. 1878. 

 Evolution and Epigenesis. Woods Holl Biol. Lect. 1894. 



WILSON, E. B., Experimental Studies on Germinal Localization. I. 

 The Germ-Regions in the Eggs of Dentalium. II. Experiments on 

 the Cleavage Mosaic in Patella and Dentalium. Jour. Exp. Zool. 

 1. 1904. Experiments on Cleavage and Localization in the 

 Nemertine Egg. Arch. Entw.-Mech. 16. 1903. Studies on 

 Chromosomes. I. The Behavior of the Idiochromosomes in 

 Hemiptera. Jour. Exp. Zool. 2. 1905. II. The paired Micro- 



