PLATE 7 



EXPLANATION OF FIGURES 



28 Proximal end of young spermatozoon showing further growth of the 

 inner tube. The cilia-like fibers at its apex have given place to a clear vesicle. 



31 Spermatozoon from smear preparation, showing the transformation which 

 occurs while it is within the spermatophore sac. The complete evagination of 

 the inner tube from within the outer results in the formation of one continuous 

 tube. The nucleus and the mitochondria now lie at opposite ends of this tube 

 and the nucleus, together with much of the gelatinous envelop and the finger- 

 form process is now within the tube. The flagellum (/.) hangs down within the 

 tube. The dotted lines represent the length of that portion of the spermatozoon 

 which is omitted from the drawing. 



(i.so 



