1. Medusetta codonium, n. sp. (Pl. [120], fig. 1).
Shell ovate, smooth, twice as broad as the constricted mouth. Apical horn about as long as the shell, nearly straight, smooth. Feet cylindrical, smooth, irregularly curved, about as long as the shell.
Dimensions.—Length of the shell 0.08, breadth 0.05.
Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms.
2. Medusetta tiara, n. sp.
Shell campanulate, smooth, about as long as broad, and three times as broad as the constricted mouth, which is surrounded by a horizontal broad ring, like the velum of a Hydromedusa. Apical horn conical, straight, half as long as the shell. Feet divergent, irregularly curved, twice as long as the shell.
Dimensions.—Length of the shell 0.07, breadth 0.06.
Habitat.—North Atlantic (Færöe Channel), John Murray, surface.
3. Medusetta minima, n. sp.
Shell slenderly ovate, smooth, about twice as long as broad, twice as broad as the constricted mouth. Apical horn straight, vertical, of the same length. Feet somewhat longer, very thin, slightly curved at the base, in the distal half nearly parallel and descending vertically.