Shell nut-shaped, tuberculate, with subregular circular pores. Basal plate with four larger and a circle of six to ten smaller pores. Horn cylindrical, straight, two to three times as long as the shell. Feet three to five times as long as the shell, cylindrical, semicircular, with convergent and crossed distal ends. (If these ends grow together, _Gamospyris_ arises.) _Dimensions._--Shell 0.08 long, 0.11 broad; horn 0.15 to 0.2 long, feet 0.2 to 0.4 long. _Habitat._--Central Pacific, Stations 263 to 268, depth 2600 to 3000 fathoms. Genus 446. _Brachiospyris_,[64] Haeckel, 1881, Prodromus, p. 441. _Definition._--#Zygospyrida# with two simple free basal feet, without apical horn. The genus _Brachiospyris_ differs from the preceding _Dipospyris_, its ancestral form, only in the absence of the reduced apical horn, and therefore bears to it a similar {1038}relation to that which the hornless _Tristylospyris_, among the Tripospyrida, bears to the horned _Tripospyris_. _Brachiospyris_ may therefore also be derived from _Tristylospyris_ by loss of the caudal foot. 1. _Brachiospyris ocellata_, Haeckel. _Ceratospyris ocellata_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 5. Shell nut-shaped, thorny, with slight sagittal stricture and irregular roundish pores. Basal plate with four large and four alternate pairs of smaller pores. Two feet cylindrical, straight, divergent, two to three times as long as the shell. _Dimensions._--Shell 0.08 long, 0.11 broad; feet 0.2 to 0.3 long. _Habitat._--South Atlantic, Station 335, depth 1425 fathoms; also fossil in Barbados. 2. _Brachiospyris diacantha_, n. sp. (Pl. 95, fig. 5). ? _Ceratospyris diacantha_, Ehrenberg, 1872, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 303. Shell nut-shaped, tuberculate, compressed in the sagittal axis, convex on the frontal face, concave on the sagittal face, with a slight sagittal stricture; with large irregular roundish pores. Basal plate with three very large pores. Two feet cylindrical, curved, S-shaped, about twice as long as the shell. _Dimensions._--Shell 0.06 long, 0.09 broad; feet 0.1 to 0.15 long. _Habitat._--Western Tropical Pacific (Philippine Sea), Station 206, depth 2100 fathoms. Genus 447. _Dendrospyris_,[65] Haeckel, 1881, Prodromus, p. 441. _Definition._--#Zygospyrida# with two free lateral feet, forked or branched like a tree. Apex with a horn. The genus _Dendrospyris_ differs from its ancestral form _Dipospyris_ in the ramification of the two large lateral feet, which descend from the base of the shell, and are usually very large and stout, sometimes simply forked. 1. _Dendrospyris stylophora_, Haeckel. _Ceratospyris stylophora_, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. fig. 10.