Habitat.—Central Pacific, Station 271, depth 2425 fathoms.
3. Conosphæra plagioconus, n. sp. (Pl. [12], fig. 4).
Pores of the shell irregular, polygonal, twice to five times as broad as the bars; twenty to twenty-four on the radius. Conical spines about eighty, irregularly formed and scattered, with oblique (not radial) axes; about as high as broad, with eight to twelve pores in the wall.
Dimensions.—Diameter of the shell 0.25, pores 0.005 to 0.015, bars 0.003; length of the spines 0.02, basal breadth 0.02.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
Genus 91. Coscinomma,[[125]] n. gen.
Definition.—Astrosphærida with one simple lattice-sphere, covered with simple radial spines; the pores between them prolonged into hollow, conical, or cylindrical tubuli.
The genus Coscinomma exhibits among the Astrosphærida the same peculiar formation that distinguishes Ethmosphæra and Sethosphæra among the Liosphærida; each pore of the simple shell is prolonged into a short conical or cylindrical tubulus, as a rule either on the outside or on the inside of the shell, but sometimes on both sides.
Subgenus 1. Coscinommarium, Haeckel.
Definition.—Pores prolonged into short tubes both on the inside as well as the outside of the shell.