In the next tank several sea horses were swimming merrily in and out of rocks that were covered by a growth of miniature trees. They were smaller than the tiniest hobbyhorse that has ever been seen, as small almost as the toy horses in a "Noah's ark." The resemblance of these small fish, not larger than smelts or minnows, that have come to be known as "sea horses," to real horses is in the head only. The rest of the body tapers off into the ordinary fishlike form. I wondered, as I looked at these small horses of the sea, if it was from them that the old myth of the existence of mermaids arose. "Half fish, half women" were the mermaids, but "half fish, half horses" are these fish. They were lively little creatures, and swam in and out of the tiny forest as if they were playing a game of "tag." What a beautiful little forest it was to play in! The trees had brown trunks about the size of one's finger, and from the top a graceful, palmlike foliage branched out, but the foliage was not in greens, but deep, translucent reds, or coral pinks, or warm browns. While I was admiring one of the little coral pink trees, one of the sea horses swam straight into its foliage, when, to my amazement, and evidently to the amazement of the sea horse also, the foliage instantly disappeared down into the tree trunk, leaving only the brown stem standing. Aghast with surprise at the sudden revelation that this charming foliage, like the petals of the flowers in the last tank, was also a cluster of living suckers, I asked what name they were called by, and heard with disgust the answer "worms." These beautiful, curious creatures only the things we know by the loathsome word "worms!" These sea worms, or annelids, as the scientific scholars call them, build up for themselves the brown tubes that resemble the rough stems of pines or palms, and from the top they send out their worm-like bodies in clusters, where they wave back and forth in the water, to sweep in any food that may be near, always holding themselves in readiness to withdraw into their holes at danger. Whether the brilliant foliage of each tree was but the many tentacles of a single animal emerging from the tube, or whether it was a whole family of worms come up to the top of their home to gaze from the chimney, so to speak, we could not discover. But, strange to say, the grotesque little sea horse seemed to be trying to decide that question for himself, for, after swimming away a moment in fright at this sudden disappearance, he returned and appeared to be peeping down into the tube.