1. Phatnaspis lacunaria, n. sp. (Pl. 136, fig. 9).
Parmal pores irregular quadrangular, of unequal size and form, ten to twelve on each side of the primary diagonal rib, which arises from both flat sides of the two-edged spines; two primary aspinal pores opposite on both edges of the latter. Spines much compressed, sword-like, their outer half shorter than the inner.
Dimensions.—Length of the shell 0.21 to 0.23, breadth 0.18 to 0.2; basal breadth of the spines 0.01.
Habitat.—Central Pacific, Station 268, surface.
2. Phatnaspis ensiformis, n. sp.
Parmal pores irregular quadrangular, of unequal size and form, six to eight on each side of the primary diagonal rib, which arises from both flat sides of the two-edged spines; two primary aspinal pores opposite on the two edges of the latter. Spines very broad, strongly compressed, sword-like, their outer half larger than the inner.
Dimensions.—Length of the shell 0.16, breadth 0.11; basal breadth of the spines 0.02.
Habitat.—Tropical Atlantic, Station 348, surface.
3. Phatnaspis loculata, n. sp.
Parmal pores regular quadrangular, of nearly equal size and form, twelve to sixteen on each side of the primary diagonal rib, which arises from both flat sides of the two-edged spines; two primary aspinal pores on the two edges of the latter. Spines linear, compressed, very long and thin, their outer half three to four times as long as the inner.
Dimensions.—Length of the shell 0.24, breadth 0.18; breadth of the spines 0.004.
Habitat.—North Atlantic, Station 354, surface.
4. Phatnaspis fenestrata, Haeckel.
Parmal pores regular quadrangular, of nearly equal size and form, six to eight on each side of the primary diagonal rib, which arises from both flat sides of the two-edged spines; two primary aspinal pores on the two edges of the latter. Spines linear, little compressed, or nearly needle-shaped, very long and thin, their outer half five to ten times as long as the inner.
Dimensions.—Length of the shell 0.11 to 0.12, breadth 0.07 to 0.08; breadth of the spines 0.002.
Habitat.—Mediterranean (Messina), surface.
5. Phatnaspis cristata, n. sp. (Pl. 136, fig. 6).
Parmal pores circular, of very different size, separated by high square crests, ten to twelve on each side of the high, comb-like, primary diagonal rib, which arises from both flat sides of the two-
