6. Streblonia planorbulina, n. sp.
Shell very flatly conical, nearly lenticular or discoidal, with twenty to twenty-five chambers of nearly equal size, the tenth chamber a little broader than the first. Breadth of the shell exceeds five to six times the height. Pores subregular, circular, very small, half as broad as the bars; about eight on the breadth of the tenth chamber. (Resembles closely Planorbulina.)
Dimensions.—Breadth of the shell 0.3 to 0.4, height 0.06 to 0.07.
Habitat.—Indian Ocean, Zanzibar, Pullen, depth 2200 fathoms.
7. Streblonia pulvinulina, n. sp.
Shell top-shaped or flatly conical, with thirty to forty chambers of slowly increasing size, the tenth chamber about three times as broad as the first. Breadth of the shell exceeds three times the height. Pores circular, subregular, very small, about one-third as broad as the bars; about thirty in the breadth of the tenth chamber. (Resembles closely Pulvinulina.)
Dimensions.—Breadth of the shell 0.25, height 0.08.
Habitat.—Pacific, central area, Station 263, depth 2650 fathoms.
Genus 311. Streblacantha,[[351]] n. gen.
Definition.—Streblonida with simple, spherical, subspherical, or lentelliptical primordial chamber, beginning the screw-like series of spirally ascending chambers. Surface covered with radial spines.