THE STRUCTURE OF CELLS 



But the evolution of the chromosome does not always follow 

 along these lines. In a number of instances, exemplified by many 

 arthropods (e.g. Cyclops), after the early chromatic fission has been 



B 



PlO. 16. 



Salamander, Heterotype mitosis in the spennatocytes. (After Moves.) For explanation of 

 the figures see the text. 



passed through, and the number of the future chromosomes has 

 been marked out, these bodies, it is true, may form rings 

 (Gryllotalpa) or parallel rods (Cyclops), but the chromatin, instead 

 of being tolerably equally distributed throughout the length of the 



