_Dimensions._--Shell 0.11 long, 0.1 broad; horn and feet 0.12 to 0.15 long. _Habitat._--North Pacific, Station 241, depth 2300 fathoms. 4. _Calpophæna enneaphylla_, n. sp. Shell ovate, smooth, with regular circular pores. Apical horn pyramidal, half as long as the shell. (Basal plate with four cortinar pores?) Corona with nine broad, lamellar, truncate, vertical feet, about as long as the horn. _Dimensions._--Shell 0.12 long, 0.09 broad; horn and feet 0.06 long. _Habitat._--Central Pacific, Station 271, surface. {1177}5. _Calpophæna petalospyris_, n. sp. Shell campanulate, tuberculate, with irregular, roundish pores. Apical horn conical, shorter than the shell. (Basal plate with nine pores?) Corona with twelve to twenty broad, lamellar, truncate, vertical feet, of different sizes, somewhat irregular. _Dimensions._--Shell 0.08 long, 0.09 broad; horn and feet 0.07 to 0.12 long. _Habitat._--Central Pacific, Station 265, depth 2900 fathoms. Subgenus 2. _Cladocorona_, Haeckel, 1881, Prodromus, p. 430. _Definition._--Feet branched or forked. 6. _Calpophæna tetracorethra_, n. sp. Shell subspherical, smooth, with irregular, roundish pores. Basal plate with four larger pores. Apical horn and the four divergent basal feet of equal size and similar form, three to four times as long as the shell, slender, bristle-shaped, curved, in the distal half irregularly branched. (Very similar to the remarkable _Tetraspyris tetracorethra_, Pl. 53, figs. 19, 20, but with shorter appendages and with simple spherical shell, which exhibits no trace of sagittal ring and constriction.) _Dimensions._--Shell 0.12 diameter, horn and feet 0.3 to 0.5 long. _Habitat._--Central Pacific, Station 271, depth 2425 fathoms. 7. _Calpophæna hexacorethra_, n. sp. Shell subspherical, smooth, similar to the preceding species. Basal plate with six pores. Apical horn and the six divergent feet twice to three times as long as the shell, bristle-shaped, irregularly curved and branched. (Similar to _Hexaspyris hexacorethra_, Pl. 95, fig. 8, but without sagittal ring and constriction.) _Dimensions._--Shell 0.11 long, 0.13 broad; horn and feet 0.2 to 0.3 long. _Habitat._--Central Pacific, Station 274, depth 2750 fathoms. Genus 525. _Archiphæna_,[142] Haeckel, 1881, Prodromus, p. 429. _Definition._--#Archiphænida# (vel Monocyrtida multiradiata clausa), with simple internal cavity of the shell, without apical horn and axial columella. The genus _Archiphæna_ has the same simple cavity of the shell as the preceding _Calpophæna_, but differs from it in the loss of the apical horn. It bears therefore to the latter the same relation that _Gorgospyris_ does to _Petalospyris_. The two former genera may be derived from the two latter by loss of the sagittal ring and constriction. {1178}Subgenus 1. _Coronophæna_, Haeckel, 1881, Prodromus, p. 429. _Definition._--Feet simple, not branched nor forked. 1. _Archiphæna gorgospyris_, n. sp. (Pl. 98, figs. 10, 10_a_).