400 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Figs. 28-35. Stages in the development of the normal 

 spermatozoa. 



Fig. 28. Uninucleate spermatogonium from testis, 

 x 820. 



Fig. 29. Multinucleate spermatogonium from sperm 

 sac. x 1T20. 



Fig. 30. Early stage in the formation of the 

 spermatosphere, showing the first 

 cleavage of the cytoplasm. x 1720. 



Fig. 31. Formation of spermatosphere complete. 

 Surface view of spermatosphere with 

 spermatocytes. x 470. 



Fig. 32. Section of spermatosphere with spermato- 

 cytes, x 470. 



Fig. 33. A rather later stage. x 670. 



Fig. 34. Formation of spermatids which are just 

 beginning to elongate. x 610. 



Fig. 35. Spermatozoa fully formed, but still 

 attached to the blastophore. x 350. 



Figs. 36-40. Stages in the development of " giant" 

 spermatozoa. 



Fig. 36. Formation of spermatocytes, x 660. 



Fig. 37. Spermatids just beginning to elongate, 

 x 660. 



Plate VI. 



Fig. 38. Later stage in the elongation of the 

 spermatids. x 660. 



Fig. 39. Immature " giant " spermatozoa, x 660. 



Fig. 40. (a) Ordinary form of the spermatozoa, 

 x 1710. 



(b) "Giant" form of the spermatozoa, 

 x 780. 



