^S. mirabilis.^ This medusa of /Coryne/ is from one quarter to three quarters of an inch in diameter when full-grown. Its umbrella is nearly hemispherical, and from the center hangs a manubrium. From the margin of the umbrella hang four very long tentacles. The shape of its body and the length of its tentacles and proboscis are constantly changing as it moves in the water. These little medusæ are very plentiful in the spring and summer, and swim rapidly in all directions near the surface of the water. [Illustration: /Sarsia/, the free medusa of /Coryne/.] GENUS ^Tubularia^ ^T. Couthouyi.^ This species is found in the same places as /Parypha crocea/. The stem is three to six inches long, and is inclosed in a horny sheath, which is more or less ringed or jointed, or it may be smooth throughout. The head, when the tentacles are expanded, measures one and a half inches in diameter. It has a proboscis covered with tentacles, disposed in series, which grow successively shorter, the last being merely papillæ. The medusa-buds hang in clusters between the outer tentacles and the proboscis. The animal grows in bunches of five to ten tubes, which spring from a creeping, tangled stem. (Plate XLI.) GENUS ^Parypha^ ^P. crocea.^ This is one of the most beautiful of the tubularians. It has a large, drooping head on a stem three to [pg124] four inches long. It is bright red in color, and from the center of the circle of tentacles the reproductive zoöids hang in a cluster, like a bunch of grapes. It does not liberate swimming-bells. It is found in bunches on piles of wharves and bridges, in brackish water, on the eastern coast as far south as Charleston, South Carolina. ^Corymorpha pendula.^ See Plate XLII. GENUS ^Hybocodon^ ^H. prolifer.^ One of the largest tubularians, somewhat resembling /Parypha crocea/. It is deep orange in color, and the head is erect on a long stem. The reproductive zoöids are in a cluster in the center of a double row of tentacles, and resemble a basket of fruit. It grows singly, or in groups of two or three, in shaded tide-pools, which are protected from the surf, and in which the water is very pure. It is found on the Massachusetts coast, but is not common. This species liberates swimming-bells. (Plate XLI.) GENUS ^Pennaria^ ^P. tiarella.^ The branches are arranged alternately and at right angles to a central stem or axis; they taper, being shortest at the top and bottom of the stem. The zoöids are red in color, and are arranged along the upper side of branches at considerable intervals. The stems are black and beaded, being constricted at intervals. The zoöids have two rows of tentacles, the upper ones on a small proboscis. From the lower part of the proboscis deep, bell-shaped bodies, which eventually become swimming-bells, are developed. The species is found on rocks and eel-grass along the whole eastern coast.