Page:Scientific results HMS Challenger vol 18 part 1.djvu/376

168 Dimensions.—Diameter of the whole shell 0.22; distance between each two shells 0.02; length of the by-spines 0.05, of the main spines 0.2.

Habitat.—Indian Ocean, Cocos Islands, surface, Rabbe.

Definition.— with spongy, spherical shell (with or without enclosed concentric lattice-shells).

Definition.— with solid, spongy, spherical shell and four crossed simple spines.

The genus Staurodoras may be developed from Styptosphæra by the production of four crossed spines on the simple, spongy, spherical shell, which is composed of looser or denser irregular wicker-work, without enclosed medullary shell.

1. Staurodoras spongosphæra, n. sp.

Four crossed spines, two to three times as long as the diameter of the spongy sphere, three-sided prismatic, with three dentated and spirally contorted edges. (Form of Spongosphæra streptacantha, but without medullary shell and with four equal spines, crossed regularly at right angles.)

Dimensions.—Diameter of the sphere 0.25; length of the spines 0.4 to 0.7.

Habitat.—Central Pacific, Station 271, surface.

2. Staurodoras mojsisovicsi, Dunikowski.

Staurodoras mojsisovicsi, Dunikowski, 1882, Denkschr. d. k. Akad. d. Wiss. Wien, Bd. xlv. p. 28, Taf. v. fig. 56.

Four crossed spines, one and a half times as long as the diameter of the spongy sphere, three-sided pyramidal, with three smooth edges. (What Dunikowski describes as "inner canals" of the spines are their edges.)

Dimensions.—Diameter of the sphere 0.14; length of the spines 0.18 to 0.2. basal breadth 0.04.

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

3. Staurodoras liassica, Dunikowski.

Staurodoras liassica, Dunikowski, 1882, Denkschr. d. k. Akad. d. Wiss. Wien, Bd. xlv. p. 28, Taf. v. fig. 57.

Four crossed spines, shorter than the diameter of the spongy sphere, conical or pyramidal (?).

Dimensions.—Diameter of the sphere 0.19; length of the spine 0.13, basal breadth 0.045.

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