Dimensions.—Diameter of the outer shell 0.15, inner 0.05; cortical pores 0.015 to 0.03, bars 0.008; length of the spines 0.04.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
Genus 64. Staurancistra,[[88]] Haeckel, 1881, Prodromus, p. 451.
Definition.—Staurosphærida with two concentric lattice-spheres and four crossed, equal, branched spines.
The genus Staurancistra differs from its ancestral form, Staurolonche, in the ramification of the four crossed spines.
1. Staurancistra quadricuspis, n. sp.
Cortical shell thin walled, with rough, thorny surface, and irregular, roundish pores, twice to four times as broad as the bars; six to eight on the quadrant. Medullary shell one-third as large, with regular, circular pores; connected with the cortical shell by four crossed radial beams. These are prolonged outside into four strong three-sided prismatic spines, nearly as long as the shell diameter, each having three curved branches below the distal end. (Similar to Hexancistra quadricuspis, Pl. [22], fig. 11, but with only four spines.)
Dimensions.—Diameter of the cortical shell 0.16, of the medullary shell 0.05; pores of the former 0.06 to 0.012, bars 0.003; length of the spines 0.14, breadth 0.012.
Habitat.—Central Pacific, Station 271, depth 2425 fathoms.