Definition.—A coronal of spines around every pore of the shell.
1. Chœnicosphæra murrayana, n. sp. (Pl. [8], fig. 4).
Shell spherical, with large circular or roundish pores of unequal size, two to four times as broad as the bars. Ten to twelve pores in the half meridian of the shell. Margin of every pore with a coronal of six to nine short and acute spines, not longer than the half diameter of the pore. No spines between the pores.
Dimensions.—Diameter of the shell 0.16 to 0.2, of the pores 0.02 to 0.03; length of the spines 0.008 to 0.012.
Habitat.—Færöe Channel (Gulf Stream), common. Expedition of H.M.S. "Triton," John Murray.
2. Chœnicosphæra flosculenta, n. sp.
Shell spherical, with large circular or roundish pores of different size, three to six times as broad as the bars. Six to eight pores in the half meridian of the shell. Margin of every pore somewhat prominent, with a coronal of ten to twenty parallel acute spines of different length, the largest somewhat longer than the diameter of the pore. No spines between the pores.
Dimensions.—Diameter of the shell 0.12 to 0.15, of the pores 0.02 to 0.04; length of the spines 0.02 to 0.05.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.