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.
Subgenus 1. Coronophæna, Haeckel, 1881, Prodromus, p. 429.
Definition.—Feet simple, not branched nor forked.
1. Archiphæna gorgospyris, n. sp. (Pl. [98], figs. 10, 10a).
Shell hemispherical, smooth, with small subregular, circular pores. Collar septum with four large pores (fig. 10a). Twelve to fifteen feet, divergent, lamellar, truncate, about as long as the shell. (Similar to certain forms of Gorgospyris, Pl. [87], figs. 1 to 3, but with simple shell cavity, without sagittal ring and constriction, and without a columella.)
Dimensions.—Shell 0.08 long, 0.04 broad; feet 0.03 to 0.04 long.