REPORT ON THE RADIOLARIA. 



365 



of each chamber. Kadial spines between them conical, about as long as the pores. Medullary shells 

 both spherical. 



Dimensions. Main axis O14, equatorial axis O08 ; greatest breadth of each chamber 01 ; 

 pores 0-012, bars 0'004. 



Habitat. Pacific, central area, Station 268, depth 2900 fathoms. 



8. Cyphonium faccttarium, n. sp. 



Didijmocyrtis facettaria, Haeckel, 1881, Prodromus. 



Cortical shell thick walled, with spiny surface ; pores subregular, circular, with elevated hexa- 

 gonal frames, twice as broad as the bars ; eight to nine on the half meridian, fourteen to sixteen 

 mi the half equator of each chamber. In the corners of the hexagons (between every three meshes) 

 arise radial spines, about twice as long as the pores. Both medullary shells spheroidal compressed. 

 (This species is nearly identical with the internal cortical twin-shell of Pcripanartus amphiconiscus, 

 PI. 40, fig. 5.) 



Dimensions. Main axis - 12, equatorial axis 0'07 ; greatest breadth of both chambers 0'09 ; 

 pores 0-01, bars 0'005, spines 0'02. 



Habitat. Western Tropical Pacific, Station 225, depth 4475 fathoms. 



9. Cyphonium cribellum, n. sp. (PI. 39, fig. 11). 



Cortical shell thick walled, with spiny surface ; pores regular, circular, about as broad as 

 the bars ; seven to eight on the half meridian of each chamber, thirteen to fifteen on its half 

 equator. Radial spines between them conical, twice as loug as the pores. Medullary shells both 

 lenticular. 



Dimensions. Main axis O'll, equatorial axis 0'06 ; greatest breadth 0'08 ; pores and bars 0'004. 



Habitat. North Atlantic, Station 353, surface. 



10. Cyphonium prof undum, Haeckel. 



Ommatospyris profunda, Ehrcnberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 297, 

 Taf. viii. fig. 5, Taf. x. fig. 5. 



Cortical shell thin walled, with thorny surface ; pores irregular, polygonal, three to six tunes 

 as broad as the thin bars ; five to six on the half meridian of each chamber, ten to twelve on its 

 half equator. Thorns of the surface short. Medullary shells both spherical. 



Dimensions. Main axis O'l, equatorial axis 0'06 ; greatest breadth 0'07 ; pores O'OOo to 0'012, 

 bars 0-002, spines 0'005. 



Habitat. Pacific, tropical zone ; Philippine Sea, depth 3300 fathoms, Ehrenberg ; Stations 266 

 to 274, depth 2350 to 2925 fathoms. 



