480 
SEITARO GOTO 
Female gonophores 
I have never been able to find ova outside the blastostyles, 
but in the neighborhood of very young gonophore buds which 
are simple outpocketings of the body-wall they are fairly numerous 
in the endoderm. I have not been able to make out satisfactorily 
whether they are formed by division of a single endoderm cells or 
by their bodily transformation, but my observations so far incline 
me to the latter alternative. On this point Smallwood^^ has come 
to the same conclusion in H. echinata. Fig. 10 represents a young 
female gonophore bud, a simple protuberance of the body-wall 
of the blastostyle, its cavit}" filled up by endoderm cell which 
do not show any distinct epithelial arrangement, and containing 
several ova in the spacious interstitial cavities. Several ova are 
also found in the endoderm of the blastostyle in the immediate 
neighborhood of the bud. Generally speaking, the ova in the 
latter position are younger than those in the bud, although excep- 
tions are not rare, of which one instance is seen in fig. 10. The 
young ova are ver}^ conspicuous in sections by their size, the deeply 
staining granular protoplasm and large vesicular nucleus contain- 
ing a nucleolus and a diffuse, faintly staining chromatin network. 
The}' are generally irregular in shape, but whether this is to be 
ascribed to an active movement on their part or is due to a mere 
passive adaptation to the shape of the spaces in which they lie 
cannot be determined. It is at least not necessar}^ as Goette ('07) 
maintains, to assume an active amoeboid movement to explain 
the passing of the young ova into the gonophore buds. At a 
slightly later stage (fig. 11) in which the bud is solid, is seen the 
beginning of the bell nucleus, or as Goette^ 'prefers to call iflnnen- 
ectoderm, ' ' or ' ' Parectoderm. ' ' This is formed by the proliferation 
of the cells at or near the apex of the bud, in consequence of which 
the supporting lamella is pushed inward. Thus a fold of the latter 
is formed, which is continuous all around the bud, the bell nucleus 
soon becoming more or less cap-shaped and an endodermal lamella 
forming. Previous observers^ ^ have either not mentioned or denied 
i« Smallwood: '09, p. 210. Qoette: '07, p. 78. 
