11. Cyrtophormis turricula, n. sp. (Pl. [75], fig. 5).
Shell smooth, slender, tower-shaped, with fourteen distinct strictures. The ten first joints are nearly equal in length. The twelfth joint is the largest, three to four times as long as each of the preceding, and broader than all the others, twice as broad as the suddenly constricted mouth. Pores small and numerous, regular, circular, quincuncial. Cephalis small, subspherical, with a pyramidal horn of three times the length. Peristome with a coronal of twenty to thirty very delicate, partly confluent, short, vertical teeth.
Dimensions.—Length of the shell (with fifteen joints) 0.3, breadth 0.1. Length of the twelfth joint 0.05.
Habitat.—South-Eastern Pacific, Station 298 (off Valparaiso), depth 2225 fathoms.
Subfamily 2. Stichophænida, Haeckel, 1881, Prodromus, p. 439.
Definition.—Phormocampida with the terminal mouth of the shell fenestrated (vel Stichocyrtida multiradiata clausa).
Genus 640. Artophæna,[[257]] Haeckel, 1881, Prodromus, p. 438.
Definition.—Stichophænida (vel Stichocyrtida multiradiata clausa) with six radial ribs or wings.
The genus Artophæna and the following genus Stichophæna represent together the small subfamily of Stichophænida, or of those Cyrtoidea in which the multiradiate shell is composed of numerous (four or more) joints, and closed at the end by a lattice-plate. The number of the lateral, solid, or latticed appendages is six in Artophæna, nine in Stichophæna. They may have been derived either from the Stichophormida by closure of the terminal mouth, or from the Stichoperida by intercalation of three or six interradial appendages.
1. Artophæna ærostatica, n. sp. (Pl. [75], fig. 4).