PLATE IV. 



Figs. 97-104, Later stages in the histogenesis of the sperm, all from the testis; the full length 



of the flagellum is shown only in fig. 97. 



Figs. 105-115. Spermatozoa from 

 in figs. 109, 114. 



Fig. 116. Diagram of the human 



length 



from 



Ax.F y axial filament; Cd, tail (cauda) ; CI, neck (collum) ; Cp, head (caput); Cyt, cytoplasm; M.Int, 

 intermediate substance of the neck; Mil, mitochondria; Nd.A, anterior nodulus of neck; Nd.P, 

 posterior nodulus of neck; P.a, anterior portion of head; P.C, junction piece (pars conjunctionis); 

 P.p, posterior portion of head; P.Pr, principal portion of the tail; P. 7, terminal filament. 



