VI 



CHONDRIOSOMES 



199 



by the spermatozoon. More serious perhaps is the fact that these egg 

 chondriosomes may be very unevenly distributed amongst the blastomeres 

 in cleavage (Duesberg, 1915). An unequal distribution of the chondrio- 

 somes may be brought about experimentally in Hydractinia (Beckwith, 

 1914) by centrifuging the egg. This does not prejudice the normal 

 development of the larvae. 



The persistence of the chondriosomes which are undoubtedly present 



The chondriosomes in the fertilization and cleavage of the egg of Parechmus miliaris. (After Meves, A .m.A . , 

 1912 and 1914.) A, spermatozoon ; B, shortly after entry of the spermatozoon into the egg ; C, 2-cell 

 stage ; D, 32-cell stage. 



c, chondriosome apparatus ; h, head (nucleus) of spermatozoon. 



in the fertilized egg and embryo, and their development into certain 

 specific cell structures of the adult, especially into neurofibrillae and 

 muscle nbrillae, have been described by Meves (1908) and Duesberg 

 (1910) for the chick, and also for some mammals. According to Arnold 

 (1912) they give rise to the zymogen granules in the pancreas. 



