REPORT ON THE RADIOLARIA. 129 



7. Xipliostijlus cuculus, u. sp. 



Pores regular, circular, hexagoually framed, three times as Lroad 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, pouimel-shaped. 



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

 spine 02, of the minor 005, basal breadth 0015. 



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



8. Xiphostylus trocliilus, n. sp. (PL 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 0'08, pores O'Ol, bars 0'0025. 



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



9. Xiphostylus pious, n. sjj. (PI. 14, fig. 13). 



Lithomespilus picus, Haeckel, 1881, ProJrom. et Atlas. 



Pores reg-ular, circxilar, 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 O'OOG, bars 0'003 ; length of the major polar 

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



Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



Subgenus 3. Xiiohostylissa, Haeckel. 



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

 smooth or a little rough, mthout thorns. 



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



Lithomespilus trogon, Haeckel, 1881, Prodrom. ot Atlas. 



Pores irregular, roundish or sulxiii-cular, two to three times as broad as the bars ; ten to 

 twelve on the half equator. Surface smootli. Major polar spine thi-ee-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 tliree to six similar short spines. 



(ZOOL. CHALL. EXP. PART XL. — 1885.) Rr 17 



