_Dimensions._--Shell 0.07 long, 0.09 broad; pectoral feet 0.1 long. _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 {1055}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. _Dimensions._--Shell 0.08 long, 0.13 broad; pectoral feet 0.2 long, tergal feet 0.1, caudal foot 0.06. _Habitat._--Central Pacific, Station 266, depth 2750 fathoms. 2. _Pentaspyris isacantha_, n. sp. Shell subspherical, smooth, with slight sagittal stricture. Pores small, regular circular. Basal plate with six large pores (?). All five feet equal, cylindrical, C-shaped curved, slightly divergent, about as long as the shell. _Dimensions._--Shell 0.08 long, 0.09 broad; feet 0.07 long. _Habitat._--Central Pacific, Station 268, depth 2900 fathoms. Subfamily 6. THEROSPYRIDA, Haeckel, 1881, Prodromus, p. 442. _Definition._--#Zygospyrida# tetrapoda with two pairs of descending basal feet, one pair corresponding to the anterior or pectoral, the other pair to the posterior or tergal feet of the Hexaspyrida. Genus 459. _Zygospyris_,[77] Haeckel, 1881, Prodromus, p. 442. _Definition._--#Zygospyrida# with two pairs of lateral feet and an apical horn.