GERM CELLS IN THE ARTHROPODA 137 
evidence of amitotic divisions in the sex cells of either 
Tenia tenieformis or Moniezia and concludes that 
the conditions that suggest amitosis can just as well 
or better be explained by mitosis. Experiments 
with living cells of Tania were without results, 
since the cells did not divide when placed in Ringer’s 
solution, although they continued to live outside the 
body of the host for forty-eight hours. Morse 
(1911) likewise failed to observe divisions in living 
cells of Calliobothrium and Crossobothrium which 
were kept in the plasma of the host. That the 
observation of amitosis in living cells is possible 
seems certain since Holmes (1913) has recorded an 
actual increase in the number of epithelial cells 
from the embryos and young tadpoles of several 
Amphibia that were cultivated in lymph, and has 
noted various stages of amitotic nuclear division, 
although no convincing evidence was obtained that 
this was followed by cell division. 
Insecta. In the Hemiptera amitosis was de- 
scribed by Preusse (1895) in the ovarian cells of 
Nepa cinerea and similar conditions were reported 
by Gross (1901) in insects of the same order. Gross, 
however, claims that the cells which divide amitoti- 
cally do not produce ova but are degenerating or 
secretory. 
Foot and Strobell (1911) described in ovaries of 
the bug, Protenor, the amitotic division of certain 
cells which later produce ova. There is, however, 
considerable difference of opinion among investi- 
gators as to the origin of the ova from the various 
