THE GERM-CEILS AUD THE PROCESS 05* FERTILIZATION 



in the 

 CRAB IvIEUIPPE IvIERCElTARIA. 



Contents . 



Page. 



I . Introduction "b-c 



II. Spermat ogene si s : 



1. The testis 1 



2. Methods 1 



3. The testicular tuhules 2-4 



4. General statement of spermatogenesis 4-5 



5. The spermatogonial mitoses 5-6 



6. Maturation mitoses 6-9 



7. The transformation of the spermatid into 



the sperm 9-14 



8. The sperm 14-15 



9. Sperms in the deferent duct ..15 



lu. Discussion 15-17 



III. Copulation 17-18 



lY. Spawning hahits 18-19 



V. The reproductive organs of the female 19-21 



VI. The "behavior of the sperms: 



1. Methods of study 21-22 



2. Changes in the nuclear cup 23 



3 . Change s in the capsule 23-25 



4. Changes in the central "body 25-27 



6. The dynamics of eversion 27-32 



6. The effect of reagents on everted sperms. .. .32-33 



VII. The entrance of the sperm 33-36 



VIII. Fertilization 36-39 



iZ. Discussion 39-42 



Z. Summary 42-44 



