W ENRICH.' — SpermatxjeeneHis of Phrynotettii maRDUs. 



PLATE 10. 



Photomicrographs . 



Fig. 113. — Spireme of "A" in the pachytene stage. 



Fig. 114.— Tetrad of "A." 



Fig. 115. — Pachytene spireme loop of "B." 



Fig. 116.— Tetrad of "B." 



Fig. 117.— Tetrad of "C" (type Ci). 



Fig. 118. — Both tetrads, "B" and "C," dividing equationally in the same 



spindle. 

 Fig. 119. — Tetrad "B" dividing equationally and tetrad "C" dividing re- 



ductionally in the same spindle. 

 Fig. 120.— Unequal division of "C." Smaller dyad going to same pole as 



the accessory. 

 Fig. 121. — Unequal division of "C." Larger dyad going to same pole as the 



accessory. 



