We have several times above referred to the animals known as corallines. It may almost be assumed that the ordinary reader knows what these are; if not, a little search among the treasures of the sea-shore will almost certainly reveal some of them, living or dead. The texture and appearance of the dead stems remind one of soft horn or dried gelatine; the branching arrangement of the stems and the little cells disposed at the ends of the branches will easily be shown under slight magnification. Most people will remember the rage for dyed corallines, by which all the fancy shops and florists were possessed a few years ago. The corallines, dyed a bright emerald green, or a dull red, which were used for decorations at that time, were usually a variety of the Bottle-brush Coralline, found on English shores; but sometimes commoner kinds were employed. Fig. 9 shows an example of a coralline, slightly magnified in A, and in B much more highly magnified, so as to show the individual hydra-like zooids, each with its circle of tentacula. The Sea-Anemone and the Hydra respectively represent the two great groups of the Coelenterata, named after them, the Anthozoa (Flower-animals), and the Hydrozoa (Hydra-animals). The corals are forms of the Anthozoa, single or colonial, which possess a skeleton. [Illustration: FIG. 10.--_Gorgonia verrucosa_, from Guernsey, nearly one-third of the natural size.] [Illustration: FIG. 11.--Corals. _A_, _Acanthoporia horrida_. _B_, _Meandrina strigosa_. _C_, _Madrepora divaricata_. _D_, _Fungia papillosa_. _E_, Red Coral, _Corallium rubrum_. _F_, _Stylaster sanguineus_.] The above diagram shows examples of the Anthozoa. Fig. 10 is _Gorgonia_, the Sea-Fan; while Fig. 11 represents corals of six different kinds. Besides the two great groups we have named, the Hydra-like animals and the Sea-Anemone-like animals, the Coelenterata contain a third group, the Ctenophora, or Comb-bearers, so called on account of their possessing bands of cilia, fancifully compared to the teeth of a comb. At first sight most of them somewhat resemble jelly-fishes, being transparent forms swimming near the surface of the sea. They are carnivorous, and some of them highly phosphorescent at night. The gastric cavity is divided up into branches. The representatives of the Ctenophores, most often seen on our own coasts, are small rounded forms. Two remarks must be added before quitting the subject of the Coelenterata.