Habitat.—South Atlantic, Station 325, surface.
Subgenus 2. Phatnasplenium, Haeckel.
Definition.—In the centre of each rhomboidal plate two primary aspinal pores, opposite on the two flat sides of the compressed spines, from the two edges of which the primary diagonal crest arises.
7. Phatnaspis orthopora, n. sp.
Parmal pores irregular quadrangular, of unequal size and form, four to six on each side of the primary diagonal rib, which arises from both edges of the compressed spines; two larger primary aspinal pores opposite on the two flat sides of the latter. Spines very thin and long, linear, their outer half three to four times as long as the inner.
Dimensions.—Length of the shell 0.08, breadth 0.06; breadth of the spines 0.003.
Habitat.—North Atlantic, Station 353, surface.
8. Phatnaspis polypora, n. sp.
Parmal pores irregular polygonal, of very unequal size and form, sixteen to twenty on each side of the primary diagonal rib, which arises from both edges of the compressed spines; two very large, lanceolate, primary aspinal pores opposite on the two flat sides of the latter. Spines very thin, linear, on the outside of the shell rudimentary. (This remarkable species somewhat resembles Coscinaspis polypora, Pl. [136], fig. 8.)
Dimensions.—Length of the shell 0.32, breadth 0.24; breadth of the spines 0.002.