_Definition._--Feet forked or branched. 6. _Euscenium furcatum_, n. sp. Shell campanulate, smooth, with numerous irregular roundish pores. Basal plate with nine pores (three larger central and six smaller distal). Horn club-shaped, half as long as the columella. {1148}Feet twice as long, cylindrical, parallel, vertical, forked at the distal end. (Similar to _Tripospyris semantis_, Pl. 84, fig. 2, but without sagittal feet.) _Dimensions._--Shell 0.07 long, 0.06 broad; horn 0.04 long, feet 0.1 long. _Habitat._--Tropical Atlantic, Station 348, depth 2450 fathoms. 7. _Euscenium quadratum_, n. sp. Shell campanulate, smooth with subregular square pores. Basal plate with three large pores. Horn and feet of the same size and shape, twice as long as the columella, three-sided prismatic, each with four or five verticils of lateral branches. (Similar to the cephalis of _Clathrocorys murrayi_, Pl. 64, fig. 8, but with four free spines without connecting lattice-wings.) _Dimensions._--Shell 0.06 long, 0.05 broad; horn and feet 0.12 long. _Habitat._--Central Pacific, Station 272, surface. 8. _Euscenium ramosum_, n. sp. Shell subspherical, rough, with small subregular circular pores. Basal plate with nine pores (three larger central and six smaller distal pores). Horn and feet of the same size and form, three to four times as long as the columella, three-sided prismatic, irregularly branched. _Dimensions._--Shell 0.06 diameter, horn and feet 0.15 to 0.2 long. _Habitat._--Central Pacific, Station 271, depth 2425 fathoms. Genus 505. _Cladoscenium_,[122] Haeckel, 1881, Prodromus, p. 429. _Definition._--#Archiperida# (vel Monocyrtida triradiata clausa) with a free branched internal columella, prolonged into an apical horn. Three basal feet free, without lateral wings. The genus _Cladoscenium_ differs from the preceding _Euscenium_ only in the ramification of the internal columella, which bears one or more verticils of three ascending lateral branches. The three branches of each verticil lie in the same equidistant meridian planes as the three basal feet, and are inserted with their distal ends on the inner surface of the simple lattice-shell. The three feet are also branched, but without vertical lattice-wings. _Cladoscenium_ is perhaps closely allied to _Clathrocorys_. 1. _Cladoscenium fulcratum_, n. sp. Shell subspherical, smooth, with large irregular roundish pores. Basal plate with three large pores. Columella with a single verticil of three ascending lateral branches. Apical horn as long as the {1149}columella, simple, three-sided prismatic. Feet twice as long, widely divergent, straight, prismatic, with some irregular basal branches. _Dimensions._--Shell 0.06 diameter, horn 0.05 long, feet 0.1 long. _Habitat._--Central Pacific, Station 266, depth 2750 fathoms. 2. _Cladoscenium ancoratum_, n. sp. (Pl. 53, fig. 13).