58 
Each process carries a single gonophore, which is of an oval form, 
and presents, as it approaches maturity, a subterminal aperture 
directed towards the main stem of the zoophyte. 
The gonophore is constructed on the eompDund type, and presents 
a blastostyle, sporosacs, and investing capsule. The sporosacs are 
given off near the base of the blastostyle : there is usually but a 
single one ; occasionally, however, two may be observed in one gono- 
phore. The manubrium is well developed, but there are no gastro- 
vascular canals. 
In the female sporosae a single ovum makes its appearance. Thie 
at first occupies but a small portion of the cavity of the sporosae, 
and permits the long manubrium to be easily seen, but as it grows 
it entirely fills the sporosae, and ultimately, by its pressure, causes 
the absorption, first of the walls of the sporosae, and at last of the 
manubrium and blastostyle, until nothing remains but the external 
chitinous envelope of the capsule, with the ovum floating freely 
within it. 
I have also frequently observed floating along with the ovum in 
the gonophore, a small free sporosae with well developed manubrium, 
but containing neither ova nor spermatozoa. It was probably a 
bud, formed like the ordinary sporosacs from the blastostyle, but 
never developing within it the generative elements. 
The male gonophores resemble the female in all respects except 
in the contents of the sporosacs, which are here spermatozoa, instead 
of ova. In the young gonophores the sporosae is filled with semi- 
fluid contents, which are found to be composed of a mass of cells, 
frequently with secondary cells, “ vesicles of evolution,” in their in- 
terior. The secondary cells, whether free or contained in the mother- 
cells, are filled with a corpuscular fluid, in the midst of which may 
generally be demonstrated a larger corpuscle, which under the action 
of acetic acid is rendered especially apparent as a bright spherical 
nucleus. 
The contents of the sporosae, which were at first sufficiently trans- 
parent to admit of the manubrium being clearly seen in the midst 
of them, become more and more opaque as the gonophore advances* 
to maturity, and finally completely conceal the peduncle. If the 
contents be now liberated by rupture of the sporosae, they will be 
found to consist, partly of free active spermatozoa, and partly of cells 
(vesicles of evolution), with the spermatozoa still confined in them* 
