2Q2 C. M. CHILD. 



for in many cases some blastomeres ivm.iin more or less distinct 

 while others have completely disappeared and in Mill other cases 

 the whole mass of the egg appears to he a syncytium. In my 

 earlier studies of the cleavage 1 interpreted these stages as stages 

 in the appear, nice rather than the disappearance of the cell 

 membranes. 



In these and later stages I find, both in Richards's material 

 and in my own, the most striking evidence for the occurrence 

 of amitosis that I have seen anywhere in Moniezia. Here the 

 nuclei are large and they are not crowded, consequently they 

 can be studied with less difficulty and a larger number of good 

 cases can be readily found. 



I give here a few figures drawn from Richards's slides to sup- 

 plement my earlier figures. 



In Fig. 9 five nuclei, one of them "double," are shown. No 

 cell boundaries are visible and the cytoplasm is highly vacuolated 

 and stains only slightly The two parts of the double nucleus 

 are in immediate contact and the relation of the nucleoli to the 

 dividing membrane and to each other which was mentioned 

 above is seen. 



Fig. 10 shows four nuclei, one of which appears to be dividing 

 or to have recently divided. The two parts of this nucleus are 

 of different size and are closely apposed. 



Fig. ii is an interesting case: the blastomere containing the 

 double nucleus still retains its dense un vacuolated cytoplasm 

 and to some extent its distinctness, though no actual cell mem- 

 brane can be seen. The two parts of the nucleus which it con- 

 tains are in immediate contact and flattened against each other. 

 It is difficult to understand how they could attain such a position 

 as the result of mitotic cleavage like that of the earlier stages. 

 Moreover, in those earlier stages neither Richards nor 1 ha\e 

 found any evidence of the separation of paternal and maternal 

 chro matin. 



In Fig. 12 is shown a case of apparent division which seemed 

 to me, as I examined it, particularly convincing. Here the t\\o 

 parts of the nucleus are of different si/e and a ne\\ nuclear mem- 

 brane appears to be in process of formation U-t\\een them. Its 

 formation apparently began on one side and on that side the 



