Genus 472. Tiarospyris,[[90]] Haeckel, 1881, Prodromus, p. 443.
Definition.—Tholospyrida with numerous basal feet (eight to twelve or more). Galea without a horn.
The genus Tiarospyris has probably been derived from the preceding Sepalospyris by reduction and loss of the free apical horn; it therefore bears to it the same relation that the similar Gorgospyris does to Petalospyris.
1. Tiarospyris pervia, n. sp. (Pl. [87], fig. 7).
Shell nut-shaped, smooth, with deep sagittal stricture. Cephalis on the lateral sides with numerous small roundish pores, on each side of the ring with a pair of very large holes. Basal plate with two large collar pores. Cupola flat, cap-shaped, with two large parietal pores above the ring. Coronet with eight conical, slightly divergent feet, about one-fourth as long as the shell.
Dimensions.—Shell 0.08 long, 0.1 broad; ring 0.06 long; feet 0.02 long.
Habitat.—North Pacific, Station 244, depth 2900 fathoms.
2. Tiarospyris galea, n. sp.
Shell helmet-shaped, with deep sagittal stricture. Cephalis with irregular, polygonal pores; on each side of the ring two pairs of larger annular pores. Basal plate with four large pores. Cupola high, conical, nearly as long as the cephalis, separated from it by a distinct coronal stricture. Basal coronet with twelve to sixteen slender curved divergent feet, nearly as long as the shell.
Dimensions.—Shell 0.16 long, 0.12 broad; ring 0.1 long; feet 0.15 long.