Habitat.—Pacific, central area, Station 271, surface.
9. Octopyle stenozona, n. sp. (Pl. [9], fig. 11).
Cortical shell quadrangular, with thorny surface, and four conical spines in the lateral plane, on the points, where both cortical girdles are crossed. Lateral girdle very narrow, nearly square, with rounded corners, of equal length and breadth. On the isthmus of the narrow transverse girdle only one pore. Sagittal septum of the same length as the subspherical medullary shell. Eight gates irregular roundish or nearly circular.
Dimensions.—Diameter of the medullary shell 0.04, of the cortical shell 0.14.
Habitat.—Tropical Atlantic, Station 338, depth 1990 fathoms.
10. Octopyle euryzona, n. sp.
Cortical shell nearly quadrangular, very thorny, with four bunches of stronger radial spines on the four corners. Lateral girdle broad, with rounded edges of the quadrangle, little longer than broad. On the isthmus of the broad transverse girdle four pores. Sagittal septum of the same length as the elliptical medullary shell, with many radial beams. Eight gates nearly square.
Dimensions.—Length of the medullary shell 0.05, breadth 0.035; length of the cortical shell 0.16, breadth 0.14.
Habitat.—Southern Atlantic, Station 332, depth 2200 fathoms.
11. Octopyle hexastyle, n. sp.