iv CONTENTS 



No. 4. DECEMBER 



Fernandijs Payne. Chromosomal variations and the formation of the first 

 spermatocyte chromosomos in the p]uropean earwig, Forfieuhi sp. 

 Sixty-four figures -^^^ 



Nathan Fasten. Spermatogenesis of the American crayfish, Canibarus 

 virilis and Cambarus immimis (?), with special reference to synapsis 

 and the chromatoid bodies. One text figure and t(>n plates 587 



C. E. McClung. a comparative study of the chromosomes in orthopteran 



spermatogenesis. Ten ])late8 651 



