Page:Scientific results HMS Challenger vol 18 part 2.djvu/640

1516 3. Stichocapsa tricincta, n. sp. (Pl. 78, fig. 2).

Shell smooth, spindle-shaped, twice as long as broad, with three deep strictures. Length of the four joints = 2 : 5 : 5 : 10. The third joint is the broadest. Fourth joint inversely conical, with acute basal pole. Cephalis small, subconical. Pores irregular, roundish, of very different sizes.

Dimensions.—Length of the shell 0.11. Length of the single joints, a 0.01, b 0.025, e 0.025, d 0.05; breadth 0.055.

Habitat.—Central Pacific, Station 268, depth 2900 fathoms.

4. Stichocapsa subglobosa, n. sp.

Shell thorny, broad, pear-shaped, nearly spherical, almost as broad as long, with three internal septal rings. Length of the four joints = 1 : 2 : 7 : 2. Cephalis small, subspherical. Thorax flat, conical. Third joint very large, inflated, about twice as broad as the second and fourth joints. The latter is flat, cap-shaped, with rounded basal pole. Pores regular, circular, hexagonally framed, in the third joint twice as broad as in the second and fourth joints.

Dimensions.—Length of the shell 0.24. Length of the single joints, a 0.02, b 0.04, c 0.14, d 0.04; breadth 0.2.

Habitat.—Central Pacific, Station 265, depth 2900 fathoms.

5. Stichocapsa compressa, Haeckel.

Lithocampe compressa, Stöhr, 1880, Palæontogr., vol. xxvi. p. 103, Taf. iv. fig. 5.

Shell rough, broad, pear-shaped, almost as broad as long, with three internal septal rings. Length of the four joints = 1 : 2 : 3 : 2. Cephalis very small, spherical. Thorax conical. The third joint is the broadest, strongly inflated. The fourth joint (in the figure of Stöhr broken off) is in a well preserved specimen inversely hemispherical, with rounded basal pole. Pores very small, regular, circular.

Dimensions.—Length of the shell 0.1. Length of the single joints, a 0.013, b 0.027, c 0.04, d 0.022; breadth 0.08.

Habitat.—Fossil in Tertiary rocks of Sicily; Grotte, Caltanisetta.

6. Stichocapsa pyriformis, n. sp.

Shell rough, pear-shaped, about twice as long as broad, with three internal septal rings. Length of the four joints = 2 : 5 : 2 : 9. Cephalis small, spherical, hyaline. Thorax conical. Third joint very short and broad; the fourth joint is the broadest, half as long as the shell, with an inversely hemispherical basal pole. Pores subregular, circular, small and numerous, larger in the basal third.

Dimensions.—Length of the shell 0.18. Length of the single joints, a 0.02, b 0.05, c 0.02, d 0.09; breadth 0.1.

Habitat.—Fossil in Barbados.