STUDIES ON INSECT SPERMATOGENESIS. 359 



EXPLANATION OF PLATES. 



All of the figures have been outlined as far as possible with the camera 

 lucida at an initial enlargement of approximately 3800 diameters. At so 

 great an enlargement it has of course been necessary to correct the outlines 

 extensively and to add much of the finer detail free hand. In reproducing, 

 the figures have been reduced uniformly to an enlargement of approximately 

 2300 diameters. In every case the method employed in the preparation of 

 the original object has been indicated. 



A, acrosome G, Golgi remnant 



a, acroblast N, nebenkern 



c, centrioles n, nucleus 



ch, chromosomes p, pseudo-blepharoplast 



