Definition.—Apophyses of the spines branched; therefore each spine with eight to twenty or more sutural condyles.
3. Stauraspis furcata, n. sp.
Radial spines thin, quadrangular, prismatic; outer and inner halves nearly of equal length. The four apophyses of each spine simply forked (or partly with bifid fork-branches); each spine with eight to twelve sutural condyles. Meshes of the shell ten to twenty times as broad as the bars.
Dimensions.—Diameter of the shell 0.15; breadth of the spines and bars 0.003.
Habitat.—Central Pacific, Station 266, surface.
4. Stauraspis stauracantha, n. sp. (Pl. [137], figs. 5, 6).
Radial spines thin, in the inner longer half cylindrical, in the outer half conical with thickened base. Four apophyses of each spine doubly forked or dichotomously (more or less irregularly) branched; each spine with sixteen to twenty-four sutural condyles. Meshes of the shell of very different sizes and forms; the largest ten to fifteen, the smallest two to three times as broad as the bars.
Dimensions.—Diameter of the shell 0.14; breadth of of the spines 0.002 to 0.01, of the bars 0.002.
Habitat.—Tropical Atlantic, Station 343, surface.