Dimensions.—Shell 0.08 long, 0.12 broad; spines 0.01 to 0.03.
Habitat.—Tropical Atlantic, Station 347, depth 2250 fathoms.
4. Ceratospyris mulderi, n. sp. (Pl. [86], fig. 4).
Shell polyhedral, with deep sagittal stricture, studded with fifty to seventy prismatic spines; two inferior (pectoral) spines about as long as the shell, the others much shorter. Pores polygonal. On the frontal and the occipital face one pair of very large pores. Basal plate with two distinctly hexagonal pores. Bars of the loose network prismatic. Dedicated to my dear friend, the excellent author and painter, Ludwig Mulder, of the Hague.
Dimensions.—Shell 0.07 long, 0.12 broad; spines 0.01 to 0.08.
Habitat.—Indian Ocean, Sunda Straits (Rabbe), surface.
5. Ceratospyris strasburgeri, n. sp. (Pl. [86], fig. 2).
Shell polyhedral, with slight sagittal stricture, studded with thirty to forty prismatic spines, which are about half as long as the shell (two or four inferior are longer). Pores roundish, with polygonal frames. On the frontal and occipital face two pairs of larger pores (the superior smaller). Basal plate with two large pentagonal pores. Bars of the network prismatic. Dedicated to my dear friend, the celebrated botanist, Professor Eduard Strasburger, of Bonn.
Dimensions.—Shell 0.07 long, 0.1 broad; spines 0.02 to 0.04.
Habitat.—Western Tropical Pacific, Station 225, depth 4475.