In my submarine glimpses I saw spaces free from seaweed on which hundreds of tall polyps were growing, some singly, others in small tufts. The solitary individuals rise three or four inches by a nearly straight stalk, surmounted by a many-tentacled head. This droops gracefully to one side and the general effect is that of a bed of rose-coloured flowers. From the heads hang grape-like masses, which on examination in a tumbler are seen to be immature medusae. Each of these develop to the point where the four radiating canals are discernible and then their growth comes to a standstill, and they never attain the freedom for which their structure fits them. When the wind blew inshore, I would often find the water fairly alive with large sun-jellies or _Aurelia_,--their Latin name. Their great milky-white bodies would come heaving along and bump against me, giving a very "crawly" sensation. The circle of short tentacles and the four horse-shoe-shaped ovaries distinguish this jelly-fish from all others. When I had gone down as far as I dared, I would sometimes catch glimpses of these strange beings far below me, passing and repassing in the silence and icy coldness of the watery depths. These large medusae are often very abundant after a favourable wind has blown for a few days, and I have rowed through masses of them so thick that it seemed like rowing through thick jelly, two or three feet deep. In an area the length of the boat and about a yard wide, I have counted over one hundred and fifty _Aurelias_ on the surface alone. When one of these "sunfish," as the fishermen call them, is lifted from the water, the clay-coloured eggs may be seen to stream from it in myriads. In many jellies, small bodies the size of a pea are visible in the interior of the mass, and when extracted they prove to be a species of small shrimp. These are well adapted for their quasi-parasitic life, in colour being throughout of the same milky semi-opaqueness as their host, but one very curious thing about them is, that when taken out and placed in some water in a vial or tumbler they begin to turn darker almost immediately, and in five minutes all will be of various shades, from red to a dark brown.