Genus 478. Desmospyris,[[96]] Haeckel, 1881, Prodromus, p. 443.
Definition.—Phormospyrida with numerous basal feet (nine to twelve or more), without a coryphal horn.
The genus Desmospyris differs from the two preceding polypodal genera in the complete absence of horns on the coryphal face of the cephalis. It therefore corresponds to Gorgospyris among the Zygocyrtida, and arises when the numerous basal feet of the latter become connected by lattice-work.
1. Desmospyris mammillata, n. sp. (Pl. [83], fig. 14).
Shell mammillate, with deep sagittal and slight collar constriction. Pores irregular, roundish. Cephalis nut-shaped, larger than the inversely conical thorax, and twice as broad as the constricted mouth. Coronet of the peristome with twelve to fifteen short conical convergent feet, shorter than half the thorax.
Dimensions.—Cephalis 0.06 long, 0.09 broad; thorax 0.04 long, 0.06 broad.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
2. Desmospyris cyrtocolpos, n. sp.
Shell smooth, with deep sagittal and collar strictures. Pores subregular, circular, double-contoured, very small and numerous. Cephalis nut-shaped, larger than the short truncate thorax. Coronet with eighteen to twenty-four slender, irregular, pointed, convergent feet, about twice as long as the thorax.
Dimensions.—Cephalis 0.08 long, 0.12 broad; thorax 0.04 long, 0.1 broad.