Habitat.—South Pacific (off Juan Fernandez), Station 300, depth 1375 fathoms.
4. Artophæna hexapodiscus, n. sp.
Shell ovate, without external strictures, but with five internal annular septa. Length of the six joints = 1 : 2 : 3 : 4 : 3 : 6. Cephalis hemispherical, with a stout conical horn of twice the length. The last joint is the broadest, inversely hemispherical. From the fourth and fifth joints arise six divergent ribs, which are prolonged over the fifth stricture into six triangular, divergent, fenestrated feet, about as long as the last joint. Pores in the upper half of the shell regular, circular, in the lower half irregular, roundish.
Dimensions.—Length of the shell (with six joints) 0.2, breadth 0.12. Length of the single joints, a 0.015, b 0.025, c 0.03, d 0.04, e 0.03, f 0.06.
Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.
Genus 641. Stichophæna,[[258]] Haeckel, 1881, Prodromus, p. 439.
Definition.—Stichophænida (vel Stichocyrtida multiradiata clausa) with nine radial ribs or wings.
The genus Stichophæna differs from the preceding Artophæna in the typical number of the radial lateral appendages, being nine in the former, six in the latter. Usually these are simple ribs enclosed in the shell-wall, more rarely prominent wings.
Subgenus 1. Stichophænidium, Haeckel.
Definition.—Last joint of the shell rounded, without basal spines.