1. Streblonia globigerina, n. sp.
Shell subspherical, thick walled, clustered, with eight to ten nearly spherical chambers, of rapidly increasing size, the tenth chamber about twelve times as broad as the first. Breadth of the shell nearly equal to the height. Pores subregular, circular, hexagonally formed, of about the same breadth as the bars; about sixteen on the breadth of the tenth chamber. (Resembles very much the common Globigerina.)
Dimensions.—Breadth of the shell 0.18, height 0.16.
Habitat.—North Pacific, Station 253, depth 3125 fathoms.
2. Streblonia uvigerina, n. sp.
Shell nearly egg-shaped, clustered, with eight to eleven subspherical chambers of gradually increasing size, the tenth chamber about six times as broad as the first. Breadth of the shell about half its height. Pores of the shell subregular, circular, about twice as broad as the bars; about twenty on the breadth of the tenth chamber. (Resembles some species of Uvigerina.)
Dimensions.—Breadth of the shell 0.11, height 0.23.
Habitat.—South Atlantic, Station 332, depth 2200 fathoms.
3. Streblonia polymorphina, n. sp.
Shell egg-shaped, thin walled, with twelve to fourteen roundish chambers of rapidly increasing size, the tenth chamber about seven times as broad as the first. Breadth of the shell about two-thirds of the height. Pores irregular roundish, twice as broad as the bars; about twenty on the tenth chamber. (Resembles certain forms of Polymorphina.)