Innermost shell with regular, hexagonal meshes; its diameter is the same as the equal distance between each of the two shells. Threads of the network smooth. Radial spines twenty to forty, each with fifteen to twenty verticils.
Dimensions.—Diameter of the innermost shell 0.04, distance between the concentric shells 0.03 to 0.04.
Habitat.—Central Pacific, Station 266, surface.
2. Arachnopegma longispinum, n. sp.
Innermost shell with regular, hexagonal meshes; its diameter half as large as the equal distance between every two shells. Threads of the network dentated or with small knots. Radial spines fifty to sixty, each with twenty to twenty-five verticils.
Dimensions.—Diameter of the innermost shell 0.02; distance between the concentric shells 0.04 to 0.05.
Habitat.—Central Pacific, Station 272, surface.
3. Arachnopegma increscens, n. sp.
Innermost shell with regular, hexagonal meshes; its diameter quite as large as the distance between it and the second shell; only half as large as the distance between the fourth and fifth shells. Forty to fifty radial spines, each with fifteen to twenty verticils.
Dimensions.—Diameter of the innermost shell (A) 0.025; distance between the following shells—A, B = 0.025, B, C = 0.03, C, D = 0.04, D, E = 0.048, E, F = 0.056, F, G = 0.064, &c.