Dimensions.—Inner shell 0.18 long, 0.12 broad; outer shell 0.24 long, 0.18 broad; ring 0.08 long.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
3. Perispyris lentellipsis, n. sp. (Pl. [88], fig. 12).
Shell smooth, lentelliptical, with three different isopolar axes, perpendicular one to another. Transverse and sagittal strictures are wanting; but the large enclosed ring and the two pairs of large adjacent annular meshes indicate clearly the position and size of the hidden cephalis. The two other joints (the cupola on the upper and the thorax on the lower pole of the cephalis) are nearly equal, cap-shaped or hemispherical. The outer lentelliptical shell is little larger than the inner, connected with it by numerous thin bristle-shaped radial beams, and exhibits a delicate arachnoidal lattice-work.
Dimensions.—Inner shell 0.15 long, 0.1 broad; outer shell 0.18 long, 0.13 broad; ring 0.08 long.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
Subfamily 3. Nephrospyrida (vel Paradictyida, Haeckel, 1881).
Definition.—Androspyrida without free basal feet and external constrictions. Shell either spherical or discoidal.
Genus 484. Sphærospyris,[[102]] n. gen.
Definition.—Androspyrida with a spherical or subspherical shell, without basal incision and transverse constriction; without free basal feet.