7. Dendrocircus stalactites, n. sp. (Pl. [81], fig. 14).
Gate obliquely ovate. Ring irregularly ovate or roundish, very thick, without edges, armed with numerous (eight to twelve or more) short and stout branches, which are shorter than the diameter of the gate, irregularly disposed and branched, with very numerous clustered blunt ramules.
Dimensions.—Diameter of the gate 0.07 to 0.09; length of the spines 0.02 to 0.06.
Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.
Subfamily 2. Cortinida, Haeckel.
Definition.—Stephanida with typical basal feet (or cortinar feet).
Genus 405. Cortina,[[24]] n. gen.
Definition.—Stephanida with a simple dipleuric or bilateral ring, bearing at the base three divergent feet (one odd caudal and two paired lateral feet).
The genus Cortina and the following Stephanium represent together the small but very important group of Cortinida, differing from the simple Lithocircida in the possession of three typical basal feet, which are transmitted to the majority of the Nassellaria by heredity, and produce their peculiar triradial structure. They appear therefore as a combination of the simple ring (Zygocircus) with three basal feet (Plagonium). One of these three divergent feet is the odd caudal foot, opposite to the apical horn; the two others are the paired lateral or pectoral feet. (On the probable origin and the typical signification of Cortina compare above, pp. [891]-[894].)
1. Cortina tripus, n. sp. (Pl. [83], fig. 9).