APPENDIX. 
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CELLULARIA CILIATA, Pl. I. fig. 7 
The cells are alternate on the stem, and are 
curiously armed with long whip-like cilia or spines. 
On the back of some of the cells is a very strange 
appendage, the use of which is not with certainty 
ascertained. It is a minute body, slightly resembliny 
a vulture’s head, with a movable lower beak. The 
whole head keeps up a nodding motion, and the 
movable beak occasionally opens widely, and then 
suddenly snaps to with a jerk. It has been seen tc 
hold an animalcule between its jaws till the latter 
has died, but it has no power to communicate the 
prey to the polype in its cell or to swallow and 
digest it on its own account. It is certainly not 
an independent parasite, as has been supposed, and 
yet its purpose in the animal economy is a mystery. 
Mr. Gosse conjectures that its use may be, by hold- 
ing animalcules till they die and decay, to attract 
by their putrescence crowds of other animalcules, 
which may thus be drawn within the influence of 
the polype’s ciliated tentacles. Fig. 7b shows the 
