of the _acineta_, received
the young one, nurse-like, in its fatal lap, incepted it, descended from
the parent, and crept off. Being unable to conceive at the time that
this was such an act of atrocity on the part of the _amoeba_ as the
sequel disclosed, and thinking that the young _acineta_ might yet
escape, or pass into some other form in the body of its host, I watched
the _amoeba_ for some time afterwards, until the tale ended by the
young _acineta_ becoming divided into two parts, and thus in their
respective digestive spaces ultimately becoming broken down and
digested."[31]

[31] Carter, _Annals of Natural History_, 3d Series, 1863, pp. 45, 46;
quoted also by Romanes, _Animal Intelligence_, pp. 20, 21.

In the discussion of conscious and unconscious mind, I called attention
to the marginal bodies of the nectocalyx of the jelly-fish. These bodies
in the "covered-eyed" species are protected by hoods of gelatinous
tissue; in the naked-eyed species the hoods are absent. The marginal
bodies in both species are practically identical as far as general
make-up is concerned, being composed of an accumulation of
brightly-colored pigment-cells, embedded in which are several minute
clear crystals. Nerve-fibres connect these bodies with the sensorium
("nerve-ring").

Jelly-fish seek the light, and they can be made to follow a bright light
from one side of the aquarium to the other by manipulating the light in
the proper manner. Even where a slight current is set up in the water,
they will swim against it in their efforts to reach the light.

When two or more of the marginal bodies are excised, no effect seems to
follow such excision, but as soon as the last of these bodies is cut
out, the creature falls to the bottom of the tank without motion.

When a point in the nectocalyx is irritated with a point of a needle or
by a vegetable or mineral irritant, the tip of the manubrium will turn
toward, and endeavor to touch, the spot irritated. It does not turn at
once, as it would were its movements the result of reflex action; it
moves deliberately as though actuated by volition.

The above experiments and observation seem to indicate the presence of
conscious determination in the medusa; in fact, there seems to be a
distinct element of choice in these psychical manifestations.

While engaged in watching a water-louse, I saw it swim to a hydra, tear
off one of its buds, and then swim some distance away to a small bit of