100 REDFERN, ON FLUSTRELLA HISPIDA. 
cles were gradually distended with fluid, and the body slowly 
pressed out of the cavity of the cell. 
By dissection, ova or statoblasts are obtained in great 
numbers, presenting the appearances represented in figs. 8 
and 10, and consisting of an outer envelope, contaming a 
number of clear and highly refractive nucleated cells, and an 
opaque, reddish, spherical mass, composed of cells with red 
granular contents. When some of the contents of these 
bodies have escaped, their structure is much more easily ex- 
amined, as in fig. 9. None of those figured possessed cilia. 
The cilia belong to a membrane, which is placed outside the 
two capsules figured, and separated from the outer of these 
by a finely granular mass. Only one of these bodies was 
observed to have cilia, amongst twenty or thirty carefully ex- 
amined to determine their presence or absence. 
Development.—My reasons for believing that the animal 
whose development has been examined is the same as the one 
just described are :—lst, that it grew on the wall of an 
aquarium, in which there were numbers of specimens of 
Flustrella growing on Chondrus mamillosus, and, so far as 
I could judge, no other which could be mistaken for it ; 
2d, that on the cell of the second polypide hairs grew of 
a similar character to those shown in figs. 1, 2, and 3; 3d, 
the character of the tentacular crown, and the number of 
the tentacles, as far as it could be determined in a bad posi- 
tion for counting them, and the appearance of the digestive 
organs, were exactly such as occurred in the creature figured 
from 1 to 10. 
On the 3d of July, 1857, I first observed a solitary poly- 
pide in its cell, on the wall of an aquarium. It was appa- 
rently in perfect health, alternately protruding and with- 
drawing its beautiful, bell-shaped crown of tentacles. The 
elegance of the form of the bell, and the number of its 
tentacles, led me to compare it with the specimens growing 
on Chondrus in the same vessel, and the result was, that I 
could find no difference between them. On this occasion I 
did not notice any projection of the wall of the cell for the 
formation of a gemma. 
On the 4th of July, a definite projection of the wall was 
observed (fig. 11) ; two days later the projection had imcreased 
in size considerably, and it presented externally a protruded 
portion of the wall of the original cell, and in its interior a 
striation slightly radiating towards the surface, the striz 
being produced of rows of highly refractive globules (fig. 21.) 
On the evening of this second day, the body of the polypide 
was. visible, as a small cone, at the deepest part of the 
