GERM CELLS OF ANURANS 299 
Meves, F. 1896 Ueber die Entwicklung der mannlichen Geschlechtszellen von 
Salamandra maculosa. Arch. f. mikr. Anat., Bd. 48. 
1911 Chromosomenlangen bei Salamandra, nebst Bemerkungen zur 
Individualitatstheorie der chromosomen. Arch. mikr. Anat., Bd, 77. 
Metz, C. W. 1914 A preliminary study of five different types of chromosome 
groups in the genus Drosophila. Jour. Exp. ZooL, vol. 17. 
McClung, C. E. 1899 A peculiar nuclear element in male reproductive cells 
of insects. Zool. Bull., no. 2. 
1900 The spermatocyte divisions of the Acrididae. Kansas Uni- 
versity Quarterly, vol. 9. 
1914 A comparative study of the chromosomes in orthopteran sper- 
matogenesis. Jour. Morph., vol. 25. 
1917 The multiple chromosomes of Hesperotettix and Mermiria 
(Orthoptera). Jour. Morph., vol. 29. 
Montgomery, T. H. 1903 The hetero typical maturation mitosis in Amphibia 
and its general significance. Biol. Bull., vol. 4, no. 5. 
1911 The spermatogenesis of an Hemipteran, Euschistus. Jour. 
Morph., vol. 22. 
Morgan, T. H. 1917 Heredity and sex. Columbia University Press. . 
NowLiN, Nadine 1908 The chromosome complex of Melanoplus bivitattus Say. 
Kansas Univ. Science Bull., no. 4. 
NussBAUM, M. 1880 Zur Differenzierung des Geschlechts im Tierreich. Arch, 
f. Mikr. Anat., Bd. 18. 
Payne, F. 1914 Chromosomal variations and the formation of the first sperm- 
atocyte chromosomes in the European earwig, Forficula sp. Jour. 
Morph., vol. 25. 
P.\RMENTER, C. L. 1919 Chroutosome number and pairs in the somatic mitosis 
of Amblystoma tigrinum. Jour. Morph., vol. 33, no. 1. 
1920 The chromosemes of parthenogenetic frogs. Jour. Gen. 
Physiol., vol. 11, no. 3. 
Plough, H. H. 1917 The effect of temperature on linkage in the second chromo- 
some of Drosophila. Proc. Nat. Acad. Science, vol. 3. 
Rawitz, B. 1895 Centrosoma und Attraktionssphare in der ruhenden Zelle 
des Salamanderhodens. Arch. f. mikr. Anat., Bd. 44. 
Robertson, W. R. B. 1915 Chromosome studies. III. Inequalities and defi- 
ciencies in homologous chromosomes. Jour. Morph., vol. 26. 
1916 Chromosome studies. I. Taxonomic relations shown in the 
chromosomes of Tettigidae and Acrididae: V-shaped chromosomes and 
their significance in the Acrididae, Locustidae and Gryllida: Chromo- 
somes and variation. Jour. Morph., vol. 27. 
Rubaschkin, W. 1912 Zur Lehre von der Keimbahn bei Siiugetieren. Anat. 
Hefte, Bd. 46. 
Schreiner, A. AND K. E. 1906 a Neue Studien uber die Chromatinreifung der 
Geschlechtszellen. I. Die Reifung der mannlichen Geschlechtszellen 
von Tomopterus onisciformis. Arch, de Biol., T. 22. 
1906 b Ibid. II. Reifung der mannlichen Geschlechtszellen von Sal- 
amandra maculosa, Spinax niger and Myxine glutinosa. Ibid. 
Snook, H. J., and Long, J. A. 1914 Parasynaptic stages in the testis of Aneides 
lugubris (Hallowell). University California, pub., vol. 15. 
