386 GEORGE T. HARGITT 
OBSERVATIONS AND DISCUSSION 
1. The gonophore 
The general position of the germ cells and their relation to each 
other is shown in the longitudinal section of a single gonophore 
in figure 1. In this particular instance the eggs are all in differ- 
ent stages of growth, though there is great variety in this. Es- 
pecially characteristic is the definite arrangement of the eggs, so 
far as the stage of development is concerned, the older eggs at the 
distal end while in the proximal region the eggs are so young as 
to have hardly started their growth. It is this arrangement of 
the eggs which, in part, makes Campanularia so favorable for 
study. There need be no uncertainty of the stage of development. 
of a certain egg, for if this egg does not itself show clear evidences 
of its stage of development there are those distalwards which: are 
certainly older and the ones lying proximally are younger; both 
of these, therefore, serve to indicate the probable age of the egg 
under consideration. 
Another advantage comes in the ease of comparison of stages. 
It often happens that the eggs at the proximal end of the gono- 
phore are just beginning to grow, or are half-grown, and the distal 
eggs are in stages of cleavage or perhaps are planulae ready for 
liberation. Ina single gonophore therefore, it is possible to get a 
number of different ages and to be certain of their relative stage 
of development, a condition that is not easily attained in eggs 
that develop freely and separately in the water, particularly in 
those cases, as the hydroids, where there are not many eggs ready 
for fertilization at the same time. This makes possible, not only 
a more certain but also a closer gradation of stages than is easily 
obtained under the ordinary conditions of development. These 
things make very clear the order in which certain things happen 
and therefore make a logical interpretation more precise. It 
seems very certain that, under the circumstances, no mistake 
has been made in the arrangement of the series, and no important 
stages have been omitted. 
