237 



ANIMALS 



von Winiwarter 

 Marechal 



1900 



1904, '05, '07 



A. and K. E. Schreiner 1906, '07, '08 



Lerat 1905 



Deton 1908 



Gregoire 1909 



Janssens 1905, '09 

 Janssens et Willems 1909 



Schleip 1906, '07 



Debaisieux 1909 



Montgomery 1911 



Kornhauser 1914, '15 



Wenrich 1916, '17 



Fasten 1914, '18 



Malone 1918 



Pratt and Long 1917 



Robertson 1916 



Rabbit, Man 



Tunicates, Selachians, Teleosts, Amphi- 



oxus 

 Tomopleris, Ophryotrocha, Zoogonus, 



Enteroxenos, Myxine, Salamandra, 



Spinax 

 Cyclops 

 Thysanozoon 

 Zoogontis 

 Batracoseps 

 Alytes 

 Planaria 

 Dytiscus 



Hersilia, Enchenopa 



Phrynotettix, Chorthippus 



Cambarus, Cancer 



Cants 



Mus 



Insects 



"^ 



FIG. 89. The method of chromosome reduction according to Scheme B. 

 Explanation in text. 



Scheme B. The second of the two conspicuous interpretations was 

 advanced by Farmer and Moore (1903, 1905), and is essentially as 

 follows (Figs. 89-92) : In the early heterotypic prophase the reticulum 

 becomes more thready in structure and contracts into a tight knot 

 (synizesis). When this knot loosens up the chromatic material has 



