484 
SEITARO GOTO 
of ''follicle cells" (Nahrzellen of Weismann '83). In the gono- 
phore represented in fig. 14, one of the ova has a very distinct 
layer of ectosarc, hence it was probably ripe. I have never observed 
a cell layer on the inner side of the endodermal lamella, although 
such is suggested in certain stages of the male gonophore (vide 
infra). 
Male gonophores 
As already stated, the male gonophores are generally found in 
a different colony from that of the female, although hermaphrodite 
gonophores are occasionally found. The position and mode of 
origin of the male gonophores are in no essential way different 
from those of the female. In fig. 15 is reproduced a very young 
bud. It contains a lumen which is a direct continuation of the 
gastric cavity of the blastostyle, and numerous mitotic divisions 
are taking place at the apex both in the ectoderm and endoderm, 
but especially in the latter. The cell proliferations in the ectoderm 
give rise to the rudiment of the inner ectoderm, which is seen to 
be a darkly stained mass of cells with granular protoplasm and 
without any distinct cell boundaries. In the section here repro- 
duced it has just slightly pushed the supporting lamella inward. 
The divisions in the endoderm give rise to the germ cells. These are 
mostly formed near the apex of the bud, but some appear to mi- 
grate into it ready formed from the adjoining endoderm. One 
such case is shown in fig. 15 (gm.) In the next stage here re- 
produced (fig. 16) the inner ectoderm has been formed and is 
seen to form a cap-shaped mass of cells communicating with the 
outer ectoderm by a comparatively small opening, which is bounded 
on all sides by the apical margin of the endodermal lamella. The 
position of this opening is mostly apical but it may be shifted 
considerably to one side, as in the female gonophores. The cell 
proliferation in the endoderm has become so intense as to greatly 
obscure the internal cavity, although this appears to be always 
present more or less. In my opinion, the germ cells are still all 
in the endoderm in the section reproduced in fig. 16, so that all 
the nuclei contained in the cap-shaped mass above mentioned 
