Page:Scientific results HMS Challenger vol 18 part 1.djvu/913

Rh 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.)

Dimensions.—Breadth of shell 0.22, height 0.14.

Habitat.—Pacific, central area, Station 266, depth 2750 fathoms.

4. Streblonia bulimina, n. sp.

Shell nearly egg-shaped, thick walled, clustered, with fourteen to eighteen egg-shaped chambers of rapidly increasing size, the tenth chamber about eight times as broad as the first. Breadth of the shell about two-thirds of the height. Pores irregular, roundish, half as broad as the bars; about twelve on the breadth of the tenth chamber. (Resembles closely Bulimina.)

Dimensions.—Breadth of the shell 0.17, height 0.24.

Habitat.—Pacific, central area, Station 268, depth 2900 fathoms.

5. Streblonia rosalina, n. sp.

Shell top-shaped or flatly conical, with twelve to sixteen chambers of gradually increasing size, the tenth chamber about four times as broad as the first. Breadth of the shell twice as large as the height. Pores subregular, circular, very small, of the same breadth as the bars; about twelve on the breadth of the tenth chamber. (Resembles some forms of Rosalina.)

Dimensions.—Breadth of the shell 0.27, height 0.13.

Habitat.—Pacific, central area, Station 271, depth 2425 fathoms.

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.