Page:Scientific results HMS Challenger vol 18 part 1.djvu/363

Rh 10. Staurosphæra thomæ.

Shell thick walled, with regular, circular pores, twice as broad as the bars; twelve to fourteen on the quadrant; surface covered with short conical by-spines. Four main spines conical, twice as long as the radius, twice as broad as one mesh.

Dimensions.—Diameter of the sphere 0.2, pores 0.012, bars 0.006.

Habitat.—South Atlantic, Station 332, depth, 2200 fathoms.

Definition.—Pores irregular, of different size or form; surface smooth.

11. Staurosphæra judæ, n. sp.

Shell thin walled, smooth, with irregular, polygonal pores, twice to four times as broad as the bars; six to ten on the quadrant. Four main spines three-sided pyramidal, as long as the radius.

Dimensions.—Diameter of the sphere 0.15, pores 0.006 to 0.012, bars 0.003.

Habitat.—Central Pacific, Station 273, depth, 2350 fathoms.

12. Staurosphæra crassa, Dunikowski.

Staurosphæra crassa, 1882, Denkschr. d. k. Akad. d. Wiss. Wien, Bd. xlv. p. 27, Taf. v. figs. 52-55.

Shell thick walled, smooth, with irregular, roundish pores, scarcely broader than the bars; eight to ten on the quadrant. Four spines three-sided pyramidal, nearly as long as the shell diameter.

Dimensions.—Diameter of the sphere 0.19, pores and bars 0.015.

Habitat.—Fossil in the Alpine Lias (Schafberg near Salzburg, Dunikowski).

13. Staurosphæra apostolorum, Haeckel.

? Cenosphæra megapora, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. iii. fig. 1.

? Cenosphæra micropora, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. iii. fig. 2.

Shell thin walled, smooth, with large, irregular, roundish pores, twice to six times as broad as the bars; four to six on the quadrant. Four spines conical, very stout, about as long as the shell diameter, often more or less irregularly disposed.

Dimensions.—Diameter of the sphere 0.12 to 0.2, pores 0.01 to 0.03, bars 0.005.

Habitat.—Fossil in Barbados.