208 MARY T. HARMAN 
Child (11) in a paper in which he bases his observations on 
slides of Moniezia prepared by Richards, finds what he inter- 
prets as numerous cases of amitosis. In speaking of his work 
and that-of Richards, he says: ‘‘The difference between us seems 
to me to rest now on Richards’s failure to recognize, or interpret 
as I have done, what his material actually shows.’’ Further in 
the same paper he says: “I am perfectly well aware that none 
of these figures and likewise none of my earlier figures constitute 
a real demonstration of the occurrence of amitosis, for such a 
demonstration is impossible in fixed material.”’ 
The occurrence of amitosis both in the oogonial and the 
spermatogonial cells of Leptinotarsa signaticollis is recorded by 
Wieman (710). He says that ‘‘amitosis is merely transient and 
inconspicuous in the ovogonia. In the spermatogonia it is more 
prominent, persists longer and is involved in the formation of 
the cysts.” 
Foot and Strobell (11) describe amitosis as taking place in 
the ovaries of Protenor. Payne (’12) has shown in Gelastocoris 
that the cells which Foot and Strobell describe as dividing ami- 
totically are food cells and therefore do not give rise to ova. 
To the above observations might be added those of Glaser, 
Johnson, Young and others. In most cases, however, where 
amitosis has been described as occurring in the sex cells, subse- 
quent observers have shown that a different interpretation is 
possible and that it yet remains to be proved that the sex 
cells may divide amitotically and afterward give rise to new 
individuals. : 
In September, 1910, at the suggestion of Dr. Payne,? I began 
my work on cell-division in the sex cells of the tape worm. On 
account of the theoretical interest of the question, I have 
confined my work to the sex cells. If amitosis can be proved 
to take place in the cells which afterward go to form new indi- 
viduals, the occurrence of it in the somatic cells will not be 
questioned. 
2 I wish to thank Dr. Fernandus Payne for many helpful suggestions during 
the course of my work and to express my indebtedness to B. H. Ransom for iden- 
tifying my material and to C. E. Wilson for assistance in securing material. 
