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 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).