2. Polypetta alveolata, n. sp.
Shell campanulate, thorny, about as long as broad, very similar to that of Medusetta craspedota (Pl. [120], fig. 4). Shell-wall hollow, with subregular hexagonal alveoles. Peristome prolonged into a short funnel-shaped proboscis, twice as long as the similar velum of the latter. The velum is surrounded by a corona of eight larger and eight to twelve smaller feet; the larger are about as long as the shell, divergent, irregularly curved, thorny, and distinctly alveolate; the smaller feet are scattered above the latter and form an immediate transition to the small spines of the shell-surface.
Dimensions.—Length of the shell 0.08, breadth 0.09.
Habitat.—South Pacific, Station 284, surface.
3. Polypetta tabulata, n. sp. (Pl. [116], figs. 2, 2a, 2b).
Porospathis tabulata, Hæckel, 1879, Sitzungsb. med.-nat. Gesellsch. Jena, Dec. 12.
Shell subspherical, with elegantly panelled or tabulate surface, composed of small triangular plates, which are separated by a network of prominent crests; at each nodal point of the network a small conical thorn arises (figs. 2a, 2b). Each triangular plate seems to contain a hollow alveole, which opens into the shell-cavity (?). On the surface of the shell are scattered numerous (thirty to forty or more), cylindrical, hollow, radial spines, which are straight or slightly curved, not distinctly alveolate, and increase in size towards the mouth. The aboral spines are scarcely one-third as long as the radius of the shell, whilst the oral spines are three times as long as its diameter. The proboscis of the constricted mouth is a hollow cylinder, longer than the shell-radius, and armed with a corona of fifteen to twenty slender bristle-shaped teeth. The position of this singular species in this family is doubtful.
Dimensions.—Diameter of the shell 0.1 to 0.11, length of the peristome 0.07, breadth 0.02.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.
4. Polypetta mammillata, n. sp. (Pl. [116], figs. 1, 1a).