REPORT ON" THE RADIOLARIA. 127 



Dimensions. — Diameter of the sphere 0'18, pores O'Ol to 0'015, Iwirs O'OOS ; length of the polar 

 spines 0-25 to 0-3, thickness 0-02. 



Habitat. — Indian Ocean, surface ; Ceylon, HaeckeL 



Genus 46. Xiphostylus,^ Haeckel, 1881, Prodromus, p. 450. 



Definition. — S t y 1 o s p li aj r i d a with one single lattice-sphere and two free spines 

 of different size or form. 



The genus Xip]iostijlu.s difl'ers from the foregoing Xiphosphcera in the unequal 

 size or form of both polar spines, which, become more or less differentiated. 



Subgenus 1. Xipliostylantha, Haeckel. 



Definition. — Pores of the spherical shell regular, of nearly equal size and form; 

 surface smootli or a little rough, without sjjines or thorns. 



1. Xiphostylus alcedo, n. sp. (PL 13, fig. 4). 



Pores regular, circular, with elevated hexagonal frames, twice as broad as the bars. Eight to ten 

 pores on the half equator. Surface smooth. Polar spines three-sided pyramidal, as broad at the 

 base as one hexagon ; the major spine four to five times as long as the minor, which is about 

 equal to the radius of the sphere. 



Dimensions. — Diameter of the sphere 012, pores 0'012, bars 0'006 ; length of the major polar 

 spine 0-16 to 0-2, of the minor 0-04 to 0'06, basal breadth 0-02. 



Hahitat. — Western Tropical Pacific, Station 225, depth 4475. 



2. Xiphostylus p>hasianus, n. sj). (PL 13, fig. 9). 



Pores regular, cu-cular, twice as broad as the bars. Eight to ten pores on the half equator. 

 Outer 023ening of each pore elegantly lobed, with eight indentations. Surface a little rough. Polar 

 spines very unequal ; major spine sword-hke, sharply edged, about as long as the diameter of the 

 sphere ; minor spine scarcely half so long, pommel-shaped, with nine (?) wing-like edges. 



Dimensions. — Diameter of the sphere 0'13, inner cu-cular opening of the pores O'Ol, outer eight- 

 lobed opening 0-015, bars 0-005 ; length of the major polar spine 0-14, of the minor 0-06, 

 breadth 003. 



Habitat. — Australian Sea, Station 162, surface. 



3. Xiphostylus motacilla, n. sp. 



Pores regular, circular, three times as broad as the bars ; sixteen to twenty on the half equator. 

 Surface smooth. Polar spines compressed, two-edged, at the base three to four times as broad as 



1 Xt^j/iosii/fus = Sword style ; |/(poj, aTj/TiOf. 



