When the polypus was removed by a needle from any of the cells, these organs did not appear in the least affected.

When one of the vulture-like heads was cut off from the cell, the lower mandible retained its power of opening and closing.

Perhaps the most singular part of their structure is, that when there were more than two rows of cells on a branch, the central cells were furnished with these appendages, of only one-fourth the size of the outside ones.

Their movements varied according to the species; but in some I never saw the least motion; while others, with the lower mandible generally wide open, oscillated backwards and forwards at the rate of about five seconds each turn; others moved rapidly and by starts.

When touched with a needle, the beak generally seized the point so firmly that the whole branch might be shaken.
These bodies have no relation whatever with the production of the eggs or gemmules, as they are formed before the young polypi appear in the cells at the end of the growing branches; as they move independently of the polypi, and do not appear to be in any way connected with them; and as they differ in size on the outer and inner rows of cells, I have little doubt that in their functions they are related rather to the horny axis of the branches than to the polypi in the cells.