Dimensions.—Length of the shell 6 to 8, breadth 3 to 4; length of the radial tubes 0.16 to 0.2, breadth 0.008.
Habitat.—North Atlantic, Færöe Channel, Gulf Stream (John Murray); Hebrides (Mœbius).
4. Aulatractus ellipsoides, n. sp.
Shell ellipsoidal, about twice as long as broad, with equally rounded poles on the main axis. Radial tubes straight, cylindrical, verticillate, about twice as long as the smooth tangential bars; each verticil is cruciate, composed of four rectangularly crossed, short, lateral branches which bear a small spathilla at the distal end.
Dimensions.—Length of the shell 6.6, breadth 3.6; length of the radial tubes 0.2, breadth 0.01.
Habitat.—South Atlantic, Station 332, surface.
Subfamily 2. Aulonida, Haeckel.
Definition.—Network of the shell with polygonal, usually irregular meshes; three or four tangential tubes usually being united at each nodal point.
Genus 688. Aulonia,[[307]] n. gen.
Definition.—Aulosphærida with polygonal meshes in the network, the tangential tubes of which form a simple smooth lattice-sphere. No radial tubes at the nodal points.