GERM CELLS OF COELENTERATES 
I. CAMPANULARIA FLEXUOSA 
GEORGE T. HARGITT 
Zoological Laboratory, Northwestern University 
TWENTY-ONE FIGURES 
CONTENTS 
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INTRODUCTION 
In an earlier paper (G. T. Hargitt ’09) an account was given 
of the maturation, fertilization and segmentation of two of the 
tubularian hydroids, namely, Tubularia crocea and Pennaria 
tiarella. In the present consideration of one of the campanu- 
larian hydroids the complete oogenesis will be referred to, though 
not with equal attention to all phases. It may seem superfluous 
to add more to what has already appeared on the cytology of the 
coelenterates, and to call attention once more to the old view of 
Weismann concerning the origin and behavior of the germ cells 
of the Hydromedusae. But some features, such as continuity of 
the chromosomes, peculiarities and uniqueness of the germ cells, 
have come to have such a large place, on account to their relation 
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