Dimensions.—Diameter of the shell 0.22 to 0.26, of the pores 0.006 to 0.02.
Habitat.—Indian Ocean and Southern Pacific, Stations 162 to 169, surface.
7. Castanidium bethelli, n. sp.
Pores irregular, roundish or polygonal, two to three times as broad as the bars. Bristles one-third as long as the radius. Radial main-spines conico-cylindrical, irregularly curved, with dimpled surface, somewhat longer than the radius.
Dimensions.—Diameter of the shell 0.5 to 0.6, of the pores 0.015 to 0.03.
Habitat.—North Pacific, Stations 235 to 245, surface.
8. Castanidium moseleyi, n. sp. (Pl. [113], fig. 2).
Pores irregular, roundish or polygonal, two to four times as broad as the bars. Bristles about as long as the diameter of one pore, or a little longer. Radial main-spines cylindrical, irregularly curved, somewhat longer than the diameter of the shell; their base is more or less inflated and fenestrated, therefore the shell is nearly polyhedral.
Dimensions.—Diameter of the shell 0.7 to 0.8, of the pores 0.01 to 0.04.
Habitat.—Tropical Atlantic, Stations 346 to 349, surface.