REPORT ON THE RADIOLARIA. 129 



7. Xiphostylus cuculus, n. sp. 



Pores regular, circular, hexagonally framed, three times as broad as the bars ; ten to twelve on 

 the half equator. Surface thorny, between every three pores a short conical thorn. Polar spines 

 three-sided prismatic, the major somewhat longer than the diameter of the sphere, the minor 

 scarcely one-third as long, pommel-shaped. 



Dimensions. Diameter of the sphere 017, pores 0'012, bars 0'004 ; length of the major polar 

 spine 0'2, of the minor 0'05, basal breadth 0'015. 



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



8. Xiphostylus trochilus, n. sp. (PI. 13, fig. 10). 



Pores regular, circular, four times as broad as the bars ; eight to nine on the half equator. 

 Polar spines cylindrical, the major somewhat longer than the axis of the sphere, the minor shorter, 

 surrounded by a group of from four to eight shorter conical spines. Surface of the opposite hemi- 

 sphere smooth, without by-spines. 



Dimensions. Diameter of the sphere 0'07 to - 08, pores O'Ol, bars 00025. 



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



9. Xiphostylus picus, n. sp. (PI. 14, fig. 13). 



Lithomespilus picm, Haeckel, 1881, Prodrom. et Atlas. 



Pores regular, circular, twice as broad as the bars ; sixteen to eighteen on the half equator. 

 Polar spines cylindrical, conical at the apex, the major once and a half to twice as long as the 

 diameter of the shell, the minor scarcely half so long ; around the latter a group of twelve to 

 twenty shorter conical spines, irregularly scattered. Surface of the other hemisphere smooth. 



Dimensions. Diameter of the sphere 0'13, pores 0'006, bars 0'003 ; length of the major polar 

 spine 0-2 to 0'24, of the minor 0'08 to 0'09, basal breadth 0'02. 



Habited. Central Pacific, Station 265, depth 2900 fathoms. 



Subgenus 3. Xiphostylissa, Haeckel. 



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

 smooth or a little rough, without thorns. 



10. Xiphostylus trogon, n. sp. (PL 14, fig. 12). 



Lithomespihts trogon, Haeckel, 1881, Prodrom. et Atlas. 



Pores irregular, roundish or subcircular, two to three times as broad as the bars ; ten to 

 twelve on the half equator. Surface smooth. Major polar spine three-sided prismatic, once and 

 a half to twice as long as the axis of the sphere ; minor spine quite rudimentary, scarcely longer 

 than broad, but surrounded by a group of from three to six similar short spines. 



(ZOOL. CHALL. EXP. PART XL. 1885.) Er 1 7 



