Habitat.—North Pacific, Station 244, depth 2900 fathoms.
5. Aegospyris caprina, n. sp. (Pl. [86], fig. 8).
Shell nut-shaped, papillate, with sharp sagittal stricture. Pores irregular roundish, two pairs of larger pores on each side of the ring. Basal plate with six large pores. Eight spines all straight, subvertical and nearly parallel, cylindro-conical. Two frontal horns and two tergal feet about as long as the shell; odd horn shorter; odd foot longer. Two pectoral feet twice as long as the shell, club-shaped, with a spinulate knob at the distal end.
Dimensions.—Shell 0.06 long, 0.09 broad; pectoral feet 0.11 long.
Habitat.—Central Pacific, Station 271, surface.
Genus 458. Pentaspyris,[[76]] Haeckel, 1881, Prodromus, p. 442.
Definition.—Zygospyrida with five basal feet, without apical horn.
The genus Pentaspyris differs from the two preceding genera in the absence of any coryphal horn, and represents therefore the pentapodal form among the hornless Zygospyrida.
1. Pentaspyris pentacantha, n. sp. (Pl. [95], fig. 11).
Shell nut-shaped, tuberculate, with deep sagittal stricture. Pores irregular roundish, two pairs of larger pores on each side of the ring. Basal plate with four larger pores. All five feet cylindrical, S-shaped curved, strongly divergent, with few short branches, the two pectoral feet twice as long as the shell and the two tergal feet; odd caudal foot shorter.