Dimensions.—Diameter of the shell 0.75, length of the spines 0.6.
Habitat.—South Pacific, Station 295, depth 1500 fathoms.
3. Circostephanus polygonarius, n. sp.
Shell polyhedral, with sixty to eighty subregular, triangular, concave faces, which are separated by prominent crests. From the elevated corners of the polyhedron arise thirty to forty radial spines, which are longer than the diameter of the shell, densely covered with curved bristles and three-sided prismatic, with three spirally convoluted edges. Their distal end is surrounded by a verticil of eight or nine curved branches, and their pyramidal base by a corona of eight or nine basal pores. Mouth armed with a corona of ten conical, vertical, spinulate teeth.
Dimensions.—Diameter of the shell 0.8, length of the spines 0.9.
Habitat.—South Pacific, Station 288, depth 2600 fathoms.
Subfamily 2. Haeckelinida.
Definition.—Circoporida with dimpled spherical shell, not composed of polygonal plates. The shell is covered with small roundish dimples, never polyhedral, and the radial spines are simple, not branched, and usually not regularly arranged.
Genus 716. Haeckeliana, John Murray, 1879, in schedulis, Chall. Coll.
Definition.—Circoporida with spherical shell of a peculiar dimpled, porcellanous structure, and with a variable number of simple radial main-spines which are usually not regularly arranged.