1 74 



THE GEKM-CEI.LS 



of the ensuing division-spindle. They seem, however, to have no 

 part in tlic formation of tlic niitt)tic figure or in division, and both 



Fig. 88. — Formation of the spermatozoids in the vascular cryptogams, Marsilia {A, D, 

 E~G, Belajeff; B, C, O, Shaw), Gynuiogramme {H-K, Belajeff), and Equisetum {L-N, 

 Belajeff). 



A. Primary spermatogonium (two generations before the primary spermatocytes) in division, 

 sliovving centrosomes. B. Primary spermatocyte with pair of " blepharoplastoids " (centrosomes). 

 C. Spindle of primary spermatocyte (first maturation-division). /). Four of the eight secondary 

 spermatocytes with blepharoplast. E-G. Prophase of second maturation-division. H. Pair of 

 spermatids ( Gym?togrammc) with blepharoplasts. I-J. Formation of the ciliated band from the 

 blepharoplast. K. Nearly ripe spermatozoid, showing ciliated band (b), nucleus, and "cyto- 

 plasmic vesicle" (the latter is ultimately cast off). E Af. Spermatids of Equisetum. N. Ripe 

 spermatozoid from above, showing spiral ciliated band. O. Ripe spermatozoid of Marsilia with 

 very long spiral ciliated band. 



