Habitat.—Tropical Atlantic, Station 348, depth 2450 fathoms.
Subgenus 4. Tripospyromma, Haeckel.
Definition.—Basal plate with six or more collar pores. Commonly two small anterior jugular pores, two large middle cardinal pores, and two small posterior cervical pores; sometimes several small accessory collar pores.
12. Tripospyris hexomma, n. sp. (Pl. [95], fig. 4).
Shell thorax-shaped, tuberculate, with deep sagittal stricture and semicircular internal primary ring. Basal plate with three pairs of pores. Facial plate with two pairs, occipital plate with four pairs of large annular pores. Lateral pores smaller, irregular, polygonal. Apical horn and caudal foot half as long as the shell and as the two pectoral feet; all four spines cylindrical, two to three times as long as the shell, slightly curved.
Dimensions.—Shell 0.1 long, 0.12 broad; horn and feet 0.2 to 0.4 long.
Habitat.—Central Pacific, Station 265, depth 2900 fathoms.
13. Tripospyris semantidium, n. sp.
Shell nut-shaped, thorny, with sharp sagittal stricture and subcircular ring. Basal plate with three pairs of large pores. Facial and occipital plates each with three pairs of large squarish pores. Lateral pores small and numerous, irregular roundish. Apical horn half as long as the shell and the three feet; all four spines straight, cylindrical, with thickened club-shaped end.
Dimensions.—Shell 0.12 long, 0.13 broad; horn 0.06 long, feet 0.15.