Shell bottle-shaped, papillate, one and a half times as long as broad. Pores circular, much larger in the middle part than towards the poles. The elevated frames between them bear on the nodal points large blunt conical papillæ. Basal plate without larger pores. Horn three-sided pyramidal, one-third as long as the shell, gradually passing into the slender neck of the bottle.
Dimensions.—Shell 0.22 long, 0.15 broad; horn 0.07 long.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
5. Halicapsa pyriformis, Haeckel.
? Haliomma pyriforme, Bailey, 1856, Amer. Journ. Sci. and Arts, vol xxii. p. 1, pl. i. fig. 29.
Shell pear-shaped, a little longer than broad, covered with numerous short conical spines. Pores subregular, circular, of nearly equal size, twice as broad as the bars. Basal plate with four crossed larger ovate pores (two larger cardinal and two smaller jugular pores). Horn stout pyramidal, scarcely one-fourth as long as the shell.
Dimensions.—Shell 0.16 long, 0.14 broad; horn 0.04 long.
Habitat.—Fossil in Barbados, living in the North Pacific (Kamtschatka)?
6. Halicapsa hystrix, n. sp. (Pl. [53], figs. 5, 6).
Shell pear-shaped, subspherical, a little longer than broad, with scattered stout pyramidal spines about as long as the radius of the shell. Pores subregular, circular, three times as broad as the bars. Basal plate (fig. 6) without larger pores. Horn very large, pyramidal, longer than the shell.