^ $@ 



Fig. 406. — The development ol the spermatozoa of the earthworm. 



A, Stages from the vesicula seminaiis of a young worm ; B, from that of an older 



worm. 

 1, Sperm mother-cell ; 2-7, stages in the division|to form spermatozoa ; 7-11, shaping 



of the spermatozoa, which are still adherent to the mass of residual protoplasm 



(cytophore) ; 12, a ripe spermatozoon, unstained. The head in 12 is represented 



rather too broad. 

 The dark bodies are the nuclei, stained. 



567 



