Shell nearly cubical, papillate, with slight sagittal stricture. Pores irregular, roundish; on each side of the ring three pairs of larger pores (the undermost the largest). Basal plate with two large pores. Surface covered with conical papillæ. Four feet equal, divergent, about as long as the shell, with an external spur in the middle, and irregularly branched spines at the distal end. _Dimensions._--Shell 0.08 long, 0.12 broad; feet 0.09 long. _Habitat._--Western Tropical Pacific, Station 225, depth 4475 fathoms. Subfamily 7. POLYSPYRIDA, Haeckel, 1881, Prodromus, p. 442. _Definition._--#Zygospyrida# polypoda, with numerous descending basal feet (at least seven to nine, usually twelve to sixteen or more). Genus 463. _Petalospyris_,[81] Ehrenberg, 1847, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 54. _Definition._--#Zygospyrida# with numerous (seven to twelve or more) basal feet and one apical horn. The genus _Petalospyris_ and the following three genera form together the peculiar subfamily of Polyspyrida, differing from the other Zygospyrida in the multiplication of the radial feet, which descend from the basal face of the shell; they may therefore be also called "Zygospyrida multiradiata," and bear the closest relationship to the Archiphænida (or the "Monocyrtida multiradiata"). They differ, however, from the latter in the presence of the distinct sagittal stricture, characteristic of all #Spyroidea#. The number of the basal feet, which form a coronet around the margin of the basal plate, is commonly between twelve and sixteen, but often more. Their form is usually flat, lamellar, but often also more or less cylindrical or conical. {1060}Subgenus 1. _Petalospyrantha_, Haeckel. _Definition._--Basal plate with two large collar pores only, separated by the base of the primary ring. 1. _Petalospyris foveolata_, Ehrenberg. _Petalospyris foveolata_, Ehrenberg, 1854, Mikrogeol., Taf. xxxvi. fig. 14; Abhandl. d. k. Akad. d. Wiss. Berlin, 1875, p. 80, Taf. xxii. fig. 10. Shell campanulate, smooth, with distinct sagittal stricture and subregular circular pores. Basal plate with two large collar pores only. Apical horn and the eight feet slender, conical, slightly curved, about as long as the shell; feet somewhat divergent (often seven or nine instead of eight). _Dimensions._--Shell diameter 0.04 to 0.05; length of the horn and the feet 0.04 to 0.05. _Habitat._--Fossil in Barbados. 2. _Petalospyris floscula_, n. sp. Shell nut-shaped, tuberculate, with deep sagittal stricture and subregular circular pores. Basal plate with two large triangular pores only. Apical horn slender, conical, twice as long as the shell. Twelve to sixteen feet flattened, leaf-shaped, broad, slightly divergent, as long as the shell, with truncate distal end. _Dimensions._--Shell 0.06 long, 0.09 broad; horn 0.12 long, feet 0.05 to 0.07 long. _Habitat._--Central Pacific, Station 266, depth 2750 fathoms.