Dictyocha tripyla, Ehrenberg, 1854, Mikrogeol., Taf. xix. fig. 38 (et Taf. xxi. fig. 41?).
Each pileate piece of the skeleton is a small three-sided pyramid, similar to that of Dictyocha triommata, but differs from it in the possession of three small perpendicular teeth, which are directed downwards and start from the basal ring near the origin of the three horizontal spines.
Dimensions.—Diameter of the triangular basal ring 0.015, of the three meshes 0.007.
Habitat.—Fossil in Tertiary deposits. North Africa (Oran), Sicily (Caltanisetta).
6. Dictyocha medusa, n. sp. (Pl. [101], figs. 13, 14).
Each pileated piece of the skeleton has four equal, cruciate, triangular meshes. From the four corners of the square basal ring proceed four perradial horizontal spines, and between these four interradial curved bars, which correspond to the edges of a four-sided pyramid, arise from the centre of the four sides and become united in the centre (on the apex of the pyramid). No apical spine.
Dimensions.—Diameter of the basal ring 0.02, of the four meshes 0.01.
Habitat.—Central area of the Pacific, Station 272, depth 2600 fathoms.
7. Dictyocha staurodon, Ehrenberg.
Dictyocha staurodon, Ehrenberg, 1844, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 80.