A STUDY OF THE GERM CELLS OF GRYLLOTALPA 



BOREALIS AND GRYLLOTALPA 



VULGARIS 



FERNANDUS PAYNE 



From the Zoological Laboratory of Indiana University 1 



FIVE TEXT FIGURES AND FOUR PLATES 



CONTENTS 



1. The chromosomes in maturation 287 



A. Gryllotalpa borealis 287 



a. The chromatoid body. 292 



B. Gryllotalpa vulgaris 292 



a. Introductory statement 292 



b. Observations of Voinov 293 



c. A comparison of my observations made on material collected 



at Naples with those of Voinov 295 



d. Observations of vom Rath and a comparison with my observa- 



tions on material collected at Freiburg 297 



C. Discussion of chromosomes 298 



2. Mitochondria 301 



A. In the male germ cells 301 



B. In the female germ cells 304 



C. Discussion of mitochondria 305 



3. The acrosome 309 



4. The middle-piece 310 



5. Discussion of acrosome and middle-piece 310 



6. Chromosome numbers and species 311 



7. Addendum 313 



8. Bibliography 316 



1. THE CHROMOSOMES IN MATURATION 

 A. Gryllotalpa borealis 



In Archiv fur Zellforschung, 1912, I published a short account 

 of the chromosomes of Gryllotalpa borealis. Since then I have 

 extended my observations by an examination of a large amount 

 of material, and have also been able to compare them with obser- 



1 Contribution No. 153. 



287 



