Dimensions.—Shell 0.2 long, 0.14 broad; ring 0.09 long.
Habitat.—Central Pacific, Station 272, depth 2600 fathoms.
Genus 482. Tricolospyris,[[100]] Haeckel, 1881, Prodromus, p. 443.
Definition.—Androspyrida without free basal feet, with three distinct joints, separated by two transverse strictures; lattice-work of the shell complete, simple.
The genus Tricolospyris has arisen from the preceding Amphispyris, its ancestral form, by development of lattice-work which completely closes the large open holes remaining on the ventral and dorsal faces of the latter.
1. Tricolospyris kantiana, n. sp. (Pl. [88], fig. 10).
Shell smooth, one and a half times as long as broad, with two deep transverse strictures. Pores of the cephalis large, roundish, of nearly equal size. Cupola and thorax hemispherical, of about the same size and form, with numerous and small, double-contoured, roundish pores.
Dimensions.—Shell 0.12 long, 0.08 broad; ring 0.04 long.
Habitat.—Western Tropical Pacific, Station 225, depth 4475 fathoms.
2. Tricolospyris leibnitziana, n. sp. (Pl. [88], fig. 9).