Dimensions.—Diameter of the sphere 1.2 to 1.5, length of the bars 0.1 to 0.16, breadth 0.004.
Habitat.—Tropical Atlantic, Station 347, surface.
3. Sagmarium trigonizon, Haeckel.
Dictyosoma trigonizon, Haeckel, 1860, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 841.
Spongodictyon trigonizon, Haeckel, 1863, Monogr. d. Radiol., p. 459, Taf. xxvi. figs. 4, 5.
Bars of the spongy framework thin, irregularly curved, bearing scattered small crosses, which are composed of four small rods arising perpendicularly from the bars. Nodal points of the framework partly pierced by a hole. The peculiar network of a complete specimen, observed by me at Portofino in 1880, was so similar to that of Spongodictyon trigonizon, described above (p. [91]), and figured in 1862 in my Monograph, that I am doubtful if the two forms are not identical, the two medullary shells of the latter being accidentally entangled in the framework. (Compare p. [1602].)
Dimensions.—Diameter of the sphere 1.1 to 1.5, length of the bars 0.1 to 0.2, breadth 0.002.
Habitat.—Mediterranean (Messina, Portofino), surface.
Genus 680. Sagmidium,[[299]] n. gen.
Definition.—Sagosphærida with a spongy spherical shell, the thickened wall of which is composed of a loose spongy framework, and bears on the nodal points of its surface radial spines.