One of these dissected skeleton-leaved sea-weeds is found on rocks and on other sea-weeds, near low-water mark around British coasts. It is a tender and soft plant of a fine carmine color, and it arises from a stem, which, after growing for a while, branches in twos. Then side-twigs come off opposite each other, and one on either side of the stems and branches, and numerous hairy-looking projections arise from the upper edge of each of the twigs. Each hairy process has others on one side of it, and some of them bear little bulbs which contain the spores. It is singularly regular in its growth, and, as it is small, it looks well under low magnifying power. It is a pretty shrub-like thing, and hence its name beautiful little shrub, or Callithamnion. Another Callithamnion is that branching weed which is seen waving under water upon the stems and fronds of the tangle. It is a robust and shrubby-looking weed, which, even when dry, retains some of its elegance of form. It is of a brownish-red color, and when fresh water is added it becomes of a brilliant orange tint, and gives out a rose-colored powder. One of the many instances in which one kind of sea-weed is much more luxurious in growth on the Irish than on the British shore is noticed in the case of a beautiful skeleton-looking, crisp, red weed called “Wrangelia,” after a Swedish naturalist. Its fine stem has little whorls of fibrils one above the other, so that it presents a most strange resemblance to the common horsetails of our marsh ground. Branches come off from the whorls, which, horsetail fashion, have their bracelets on successive whorls. It has a root of fibres, and a good-sized specimen would cover a quarto page of paper. They are found on the steep sides of pools near low-water mark, under the shade of other sea-weeds, and they are to be picked on the south of England, Jersey, Belfast, and the west of Ireland.