392 MR. HANCOCK ON THE ANATOMY OF THE FRESHWATER 
into a sort of capsule, within which the egg, Pl. TIL, fig. 6 a and 
PL. IV., fig. 4 e was enveloped. The portion of the ovary, Pl. IIL, 
fig. 6 ¢, below it was short and thick, having the appearance of 
a pedicle, by which the egg was fixed to the side of the cell; 
above the capsule, the ovary, c’, was much thinner, contracting 
suddenly upwards. This would seem to demonstrate that the egg 
is developed in the interior of the ovary. 
T have also seen what I take to be the ovum of Paludicella, but 
as it differs considerably from the egg of the other freshwater 
Bryozoa, we must not pronounce with certainty. This supposed 
egg was first observed in the cell of the dead polype; two or 
three occurred ; they were attached to the upper portion of the 
interior of the cell. Afterwards one, Pl. V. fig. 7 e, was found 
in connexion with the living animal, and in this case was fixed 
by a delicate membranous sac, f, to the side of the cell, at the 
point of attachment of the filament coming from the upper end 
of the stomach, the base of the filament being apparently sur- 
rounded by the sac. This filament then, in Palucidella, is pro- 
bably an ovary; and if so, the egg must pass in a very early 
stage from it, into the membranous sac at its base, and there be 
matured. And, judging from analogy, the other filament is also 
probably connected with generation. 
In Plumatella and Fredericella however there can be no doubt 
of the ovarian character of one of the filaments attached to the 
stomach ; but the nature of the other two, Pl. IV., figs. 4 f& 5 
h, h, is not so easily determined. They certainly do not look 
altogether unlike muscular fibres; but from their attachments 
close to that of the ovary, and from their resemblance to it, they 
are most probably connected with the generative function. It 
may be that each filament is a separate ovary, and that one or two 
of them is the male organ. These polypes are most probably 
hermaphrodites—at least, in all the specimens of Plwmatella All- 
mani that I have examined, there was scarcely a cell that did not 
contain one egg or more. It may therefore be presumed that 
each individual is provided with male and female organs. Dr. 
Farre discovered moving bodies in the visceral cavity of Valkeria 
and some other of the marine forms, and described them as re- 
