12. Ceratospyris calorrhiza, n. sp. (Pl. [87], fig. 19).
Shell nut-shaped, with deep sagittal stricture, studded with numerous conical strong spines, about one-fourth as long as the shell. Basal spines irregularly branched, with root-like ends. Pores irregular, roundish, some larger pores on each side of the ring. Basal plate with four larger pores. Bars of the network roundish.
Dimensions.—Shell 0.1 long, 0.14 broad; spines 0.02 to 0.04 long.
Habitat.—Central Pacific, Station 271, surface.
Genus 466. Gorgospyris,[[84]] Haeckel, 1881, Prodromus, p. 443.
Definition.—Zygospyrida with numerous (seven to twelve or more) basal feet, without coryphal horns.
The genus Gorgospyris agrees with the three preceding genera in the possession of numerous basal feet, but differs from them in the complete absence of any horns on the coryphal face. It represents therefore the "hornless polypedal Zygospyrida," and may be derived from Petalospyris by loss of the original apical horn. The feet are commonly numerous, and often form a circle around the margin of the basal plate, similar to the circle of tentacles in many Medusæ (Gorgon).
Subgenus 1. Gorgospyrium, Haeckel.
Definition.—Feet simple, not branched.
1. Gorgospyris medusa, n. sp. (Pl. [87], fig. 1).