Genus 63. Staurolonche,[[87]] Haeckel, 1881, Prodromus, p. 451.
Definition.—Staurosphærida with two concentric lattice-spheres and four crossed, equal, simple spines.
The genus Staurolonche may be derived either from Staurosphæra by the duplication of the lattice-sphere, or from Carposphæra by the production of four crossed radial spines, lying in one meridional plane, or from Hexalonche by the reduction of two opposite spines.
Subgenus 1. Staurolonchantha, Haeckel.
Definition.—Pores of the cortical shell regular, and of nearly equal size and similar form; surface smooth.
1. Staurolonche hexagona, n. sp.
Haliomma hexagonum, Ehrenberg, 1854, Mikrogeol., Taf. xxxvb., Bd. iv. fig. 17.
Haliomma hexagonum, Haeckel, 1862, Monogr. d. Radiol., p. 434.
Cortical shell thin walled, smooth, three times as broad as the medullary shell, with regular, hexagonal pores, four times as broad as the bars; seven to eight on the quadrant. Four spines three-sided pyramidal, somewhat longer than the radius, as broad at the base as one mesh.
Dimensions.—Diameter of the outer shell 0.12, inner 0.04; cortical pores 0.012, bars 0.003; length of the spines 0.08.