Habitat.—Mediterranean; Nice, Müller; Portofino, near Genoa, Haeckel, surface.
Subgenus 3. Phatnaspidium, Haeckel.
Definition.—In the centre of each rhomboidal plate four primary aspinal spines, forming a regular cross, the centre of which receives the cylindrical or four-sided prismatic spine.
11. Phatnaspis haliommidium, n. sp. (Pl. [136], fig. 7).
Parmal pores irregular quadrangular, of unequal size and form, eight to ten on each side of the crossed diagonal ribs, which arise at right angles from the four edges of the prismatic spines; four primary aspinal pores not different from the others. Outer part of the strong spines scarcely longer than the inner. (Resembling Icosaspis tabulata, Pl. [136], fig. 2, which, however, is distinguished by the spherical shell and the larger pores.)
Dimensions.—Length of the shell 0.22, breadth 0.17; breadth of the spines 0.016.
Habitat.—North Pacific, Station 244, surface.
12. Phatnaspis mülleri, n. sp.
Haliommatidium mülleri, Haeckel, 1862, Monogr. A. Radiol, p. 419, pl. xiii. figs. 10-12.
Parmal pores regular, square, all of nearly equal size and form, twelve to sixteen on each side of the crossed diagonal ribs, which arise at right angles from the needle-shaped spines; the four primary aspinal pores not different from the others. Spines very thin and long, cylindrical; four to six times longer in the outer than in the inner part.