1082 THE VOYAGE OF H.M.S. CHALLENGER. 



size. Apical horn pyramidal, about as long as the shell. Basal coronet with twenty to twenty- 

 five slender, lamellar, pointed, vertical feet, longer than the shell. 



Dimensions. — Shell Oil long, 0-12 broad; ring 0-07 long; horn 01; feet 012 to 018 long. 



Habitat. — Central Pacific, Station 268, depth 2900 fathoms. 



Genus 472. Tuvrospyris,^ Haeckel, 1881, Prodromus, p. 443. 



Definition. — T h o 1 o s p y r i d a with numerous basal feet (eight to twelve or 

 more). Galea without a horn. 



The genus Tiarospyris has probably been derived from the preceding Sepalosp)yris 

 by reduction and loss of the free apical horn ; it therefore bears to it the same 

 relation that the similar Gorgospiyris does to Petalospyris. 



1. Tiarospyris pervia, n. sp. (PI. 87, fig. 7). 



Shell nut-shaped, smooth, with deep sagittal stricture. Cephahs 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, shghtly divergent feet, about one-fourth as long as the shell. 



Dimensions. — Shell 0-08 long, 01 broad ; ring 0'06 long ; feet 0-02 long. 



Habitat. — North Pacific, Station 244, depth 2900 fathoms. 



2. Tiarospyris galea, n. sj?. 



Shell hehnet-shaped, with deep sagittal stricture. Cephalis with irregular, polygonal pores ; on 

 each side of the ring two paks 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 016 long, 012 broad; ring 01 long; feet 015 long. 



Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



3. Tiarospyris mitra, n. sp. (PL 87, figs. 9, 10). 



Shell subspherical, smooth. Cephalis on the lateral sides with small roundish, double- 

 contoured pores, on each side of the ring with three to five pairs of larger pores, each of which 

 is closed by a thin fenestrated lamella (different on the frontal face, fig. 9, and the dorsal face, 

 fig. 10). Cupola flat, cap-shaped, separated by a distinct coronal stricture, with smaller pores. 

 Basal coronet with ten to twelve short conical convergent feet. 



Diinciisio7is. — SheU Oil long, 012 broad; ring O^Ol long; feet 0-02 long. 



Habitat. — West Tropical Pacific, Station 225, depth 4475 fathoms. 



* J'mrosp)/m= Basket with a cap ; tj«««, a-Tiv^ii. 



