BRYOZOA, WITH DESCRIPTIONS OF NEW SPECIES. 391 
attaching the inferior end of the stomach to the base of the cell ; 
but one of them is generally thicker than the rest, and may pro. 
bably be connected with the reproductive system. Paludicella 
has two such filaments; one, Pl. V., figs. 1 & 7 7, g, passing in 
the usual manner from the lower end of the stomach ; the other, 
m, d, from the upper. These two filaments are inserted upon the 
posterior wall of the cell, one a considerable way above the other. 
When the polype is retracted, these insertions are found to be a 
little: above the gastric attachments, and the filaments, fig. 27k, 
doubled upon themselves. These are thick, cylindrical, and ap- 
parently tubular, and do not at all resemble muscles, and indeed, 
from the relative position of their attachments, they seem ill 
adapted for retraction. 
In Plumatella and Fredericella, one, PI. IV., figs.4d,d, &5e, é, 
of the filaments is generally stouter than the other two, and this 
has frequently an egg, e, f, attached to it. When the ovum is 
much developed, it is difficult to make out its relationship to the 
filament or ovary; but when quite young, it has all the appearance 
of originating from the interior. On one occasion, I observed two 
egos in connexion with the ovary, one almost mature, the other 
only forming. The former, fig. 5 7, was attached rather below 
the middle of the generative organ. When the polype was pro- 
truded, this organ dragged forward the upper end of the egg; 
the other end of it was then seen to be attached to the wall of 
the cell by the continuation of the filamentous ovary e’. A little 
below the egg there was a slight oval swelling, in the interior of 
which was seen a nucleated cell, g, undoubtedly an ovum in a 
very early stage of development, and apparently in the interior 
of the ovary.* In Fredericelia, a similar nucleated cell, Pl. III., 
figs. 4.0 & 5e, has been observed in the appendage to the sto- 
mach, while the polype was yet in a very rudimentary state as 
exhibited in the bud before alluded to. In this genus, I have 
likewise seen the ovum in a considerably advanced state, in which 
also its relationship to the ovary could not be mistaken. In this 
instance, the lower portion of the generative organ had dilated 
-* T have also seen a similar nucleated cell in the enlarged filament from the 
lower end of the stomach of Bowerbankia. 
D3 
