Dictyocha staurodon, Ehrenberg, 1854, Mikrogeol., Taf. xviii. fig. 58.
Each pileated piece of the skeleton is a small, regular, four-sided pyramid, similar to the foregoing species. It differs from Dictyocha medusa in the development of a vertical apical spine, and of four small centripetal teeth, which start from the inside of the basal square, between the four perradial spines and the four ascending interradial beams.
Dimensions.—Diameter of the basal ring 0.025, of the meshes 0.01.
Habitat.—Fossil in Tertiary rocks; Tripel of Richmond, Virginia (Ehrenberg); Barbados, (Haeckel); living in the Tropical Atlantic, Station 347, surface.
8. Dictyocha fibula, Ehrenberg.
Dictyocha fibula, Ehrenberg, 1839, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 149; Mikrogeol., Taf. xviii. fig. 54, a, b, c, Taf. xix. fig. 43, Taf. xx. fig. 45, Taf. xxi. fig. 42, &c.
Dictyocha abnormis, Ehrenberg, 1845, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 76; Mikrogeol., 1854, Taf. xxxvA., Nr. xvii. fig. 9.
Dictyocha bipartita, Ehrenberg, 1854, Mikrogeol., Taf. xxii. fig. 44.
Dictyocha tenella, Ehrenberg, 1841, Abhandl. d. k. Akad. d. Wiss. Berlin, Taf. ii. fig. 11.
Each pileated piece of the skeleton stirrup-shaped, with two pairs of meshes, and a square basal ring, the four corners of which are prolonged into four perradial spines. Between the latter four interradial beams arise from the sides in pairs, and the two pairs are connected by a diagonal arch. Therefore the two opposite meshes are larger and pentagonal, the other two meshes (alternating with these) are smaller and square. No vertical spine on the apex.