20. Aulosphæra undulata, n. sp. (Pl. [109], fig. 6).
Radial tubes slender, cylindro-conical, undulate, about twice as long as the spinulate and undulate tangential tubes; studded with numerous short, perpendicular, lateral branches which are partly simple, partly forked, and bear small terminal spathillæ. The distal end of each radial tube bears usually a verticil of four to eight similar pediculate spathillæ.
Dimensions.—Diameter of the sphere 2.4; tangential tubes 0.2 long, 0.005 broad.
Habitat.—North Pacific, Station 252, surface.
21. Aulosphæra spinosa, n. sp. (Pl. [109], fig. 5).
Radial tubes and tangential tubes equal in size and similar in form, more or less curved, slender, cylindrical, densely studded with numerous irregular spines.
Dimensions.—Diameter of the sphere 1.6; tangential tubes 0.1 long, 0.004 broad.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.
Genus 684. Auloscena,[[303]] n. gen.
Definition.—Aulosphærida with triangular meshes in the network, the tangential tubes of which arise in pyramidal groups of six over the surface of the spherical shell. Radial tubes arise at the tops of the six-sided pyramids, which cover the whole surface.