1064 THE VOYAGE OF H.M.S. CHALLENGER. 



16. Petalospyris furcata, n. sp. 



Shell nut-shaped, smooth, with sharp sagittal stricture. Pores numerous, small, and circular ; 

 no larger annular pores. Basal plate with four larger and four alternate pairs of smaller pores. 

 Horn conical, about as long as the shell Feet fifteen to twenty, broadly lamellar, about twice as 

 long as the shell, in the distal half forked. 



Dimensions. Shell 0'04 long, O06 broad ; horn 0'05 long, feet 01 long. 



Habitat. South Pacific, Station 300, depth 1375 fathoms. 



17. Petalospyris lobata, n. sp. (PL 87, fig. 13). 



Shell subspherical, smooth, with slight sagittal stricture. Pores small, roundish ; on each side 

 of the ring two pairs of larger annular pores. Basal plate with four pores. Horn stout, three- 

 sided prismatic, half as long as the shell. Feet twelve to sixteen, lamellar, lobate (the most part 

 with three lobes), nearly vertical, about as long as the shell. 



Dimensions. Shell diameter 0'05 ; horn 0'03, feet 0'05 long. 



Habitat. South Atlantic, Station 335, depth 1425 fathoms. 



Genus 464. Anthospyris, 1 Haeckel, 1881, Prodromus, p. 443. 



Definition. Z ygospyrida with numerous (seven to nine or more) basal feet and 

 three coryphal horns. 



The genus Anthospyris differs from the preceding Petalospyris, its ancestral form, 

 in the possession of three horns on the coryphal face (one odd middle apical horn and 

 two paired frontal horns, one on each side). The former therefore bears to the 

 latter the same relation that Triceraspyris does to Tripospyris and Liriospyris to 

 Hexaspyris. 



1. Anthospyris mammillata, n. sp. (PI. 87, fig. 16). 



Shell nut-shaped, mamniillate, with deep sagittal stricture and irregular, polygonal pores. Basal 

 plate with two large ovate pores (?). The pediculate apical horn and the two frontal horns stout 

 and short, conical, twice to three times as large as the conical papillae of the surface. Feet twelve to 

 fifteen, lanceolate lamellar, pointed, divergent, about as long as the shell. 



Dimensions. Shell 0'05 long, 0'08 broad ; horns 0'03, feet 0'04 long. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



1 Anthospyris= Flower-basket ; oMo?, oirvf>tg. 



