REPORT ON THE RADIOL ARIA. 125 



about as long as one pore. On the lialf equator sixteen to twenty pores, of the same breadtli as the 

 bars. Shell thick walled ; whole surface spiny. Polar spines cylindrical, at the apex conical, 

 about as long as the axis of the sphere, three to four times as broad as one pore. 



Bimensions. — Diameter of the sphere Ol, pores and bars 0'005 ; length of the polar spines 0'07 

 to 0-11, thickness 0-015 to 0-02. 



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



9. Xipliosphcera Jlora , n. sp. 



Pores regular, circular, witli hexagonal frames, twice as broad as the bars. Ten to twelve pores 

 on the half equator. Shell thin walled, with spiny surfaetj ; in each corner of the hexagons is 

 one bristle-like radial spine twice as long as one pore. Polar spines three-sided prismatic, at 

 the apex pyramidal, nearly twice as long as the axis of the sphere, as broad at the base as two pores 

 (similar to Mli2Jso.ri2}hus palliatus, PL 14, fig. 7). 



Dimensions. — Diameter of the sphere 0'15, pores 001, bars 0'005 ; length of the polar spines 

 0-2 to 0-25, breadth 0-02. 



Hahitat. — Tropical Atlantic, Station 342, deptli 1445 fathoms. 



10. Xipliosphcera juno, n. .sp. 



Pores regular, circular, as broad as the bars, funnel-shaped. Fifteen to twenty pores on the half 

 equator. Shell thick walled, covered with bristle-like spines, about twice as long as one pore. 

 I'olar spines conical, thick, about as long as the axis of the sphere, twice as broad at the base as 

 one pore. 



Dimensions. — Diameter of the sphere 012, pores and bars O'Ol ; length of the polar spines 014, 

 basal breadth 0-02. 



Hahitat. — Fossil in the Barbados roclvs ; living in the greatest depth of the Tropical Pacific, 

 Station 225, depth 4475. 



11. XiphosplicBra gigantea, n. sp. 



Pores regular, circular, two to three times as broad as the bars ; twenty-eight to tliirty-two on 

 the half equator. Shell thiclc waUed, covered with short conical thorns. Polar spines three-sided 

 pyi'amidal, about as long as the radius of the sphere, as broad at the base as three pores. 



Dimensions. — Diameter of the spliere 0-25 to 0'3, pores O'Ol, bars 0'004 ; polar spines 01 to 

 015 long, 0-03 broad. 



Hahitat. — Fossil in the Tertiary rocks of Barbados and Sicily (Cattanisetta). 



Subgenus 3. Xiphosphmrissa, Haeckel. 



Definition. — Pores of the spherical shell irregular, of different size or form ; surface 

 smooth or a little rough, without spines or thorns (other than the pohir spines). 



