Habitat.—Mediterranean (Messina); Atlantic, Stations 347 to 354, surface.
4. Arachnocorys enneaptera, n. sp.
Cephalis large, campanulate, with irregular, polygonal pores, two larger stout pyramidal and numerous slender, bristle-shaped horns. Thorax of the same structure as in the preceding species, only the nine basal holes are of twice the size; the lower network denser (as in Clathrocanium diadema, Pl. [64], fig. 2). Collar septum with numerous, irregular, roundish pores.
Dimensions.—Cephalis 0.05 diameter, thorax 0.12 long, 0.22 broad.
Habitat.—Tropical Atlantic, Station 338, surface.
5. Arachnocorys araneosa, n. sp. (Pl. [56], fig. 11).
Cephalis large, subspherical, with circular, subregular, hexagonally framed pores, and twenty to thirty slender, cylindrical, straight radial spines. Thorax flatly conical, nearly of the same shape as in the two preceding species, but with nine longer ribs, and more irregular, broader network between them. From the middle of each rib arises, nearly horizontally, a strong branch, which is directed outwards. These branches are connected with the spines of the cephalis as well as with the distal half of the ribs, by dense and delicate arachnoidal network, composed of parallel, very thin, siliceous threads (in fig. 11 only partially represented). Collar septum with numerous irregular, roundish pores.
Dimensions.—Cephalis 0.04 diameter, thorax 0.1 long, 0.2 broad.
Habitat.—Central Pacific, Station 270 to 274, surface.
6. Arachnocorys arachnodiscus, n. sp.