EEPORT ON THE RADIOLARIA. 153 



Subgenus 1. Staurosphcerantha, Haeckel. 

 Definition. — Pores regular, all of nearly equal size and similar form ; surface smooth. 



1. Staurosphcera cruciata, n. sp. 



Shell thin walled, smooth, with regular, hexagonal pores, four times as broad as the bars ; ten to 

 twelve on the quadraiit. Four crossed radial spines three-sided pyramidal, as long as the diameter 

 of the shell, as broad at the base as one pore (very similar to Hezastylus phcenaxonius, PI. 21, fig. 3, 

 but with only four spines). 



Dimensions. — Diameter of the shell 012, of the pores O'OOS. l)ars 0'002. 



Habitat. — Central Pacific, Station 271, depth 2425 fathoms. 



2. StaurospluBra chi-istiana, n. sp. 



Shell thick walled, smooth, with i-egular, circular, hexagonally framed pores, three times as broad 

 as the bars ; six to eight on the quadrant. Four crossed spines six-sided pyramidal, as long as the 

 radius, as broad as one mesh. 



Dimensions. — Diameter of the shell 0'13, pores 0"012, bars 0'004. 



Habitat. — Central Pacific, Station 268, depth 2900 fathoms. 



3. Staurosphcera johannis, n. sp. 



Shell thick walled, smooth, with regular, circular pores, four times as broad as the bars ; five to six 

 on the quadrant. Four spines six-sided pyramidal, half as long as the radius, as broad as one mesh. 

 Dimensions. — Diameter of the shell 015, pores 0'02, bars O'OOS. 

 Habitat. — North Pacific, Station 241, depth 2300 fathoms. 



4. Staurosphcera pauli, n. sp. 



Shell very tliick waUed, smooth, with regular, circular, double-edged pores, four times as broad as 

 the bars ; eight to ten on the quadrant. Four spines conical, as long as the radius, as broad as 

 one mesh. 



Dimensions. — Diameter of the shell 015, pores O^OIG, bars 0'004. 



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



5. Staurosphcera petri, n. sp. 



SheU thin walled, smooth, with regular, circular pores, three times as broad as the bars; twenty 

 to twenty -two on the quadrant. Four spines conical, half as long as the radius, as broad as one 

 mesh. 



Dimensions. — Diameter of the shell 0'22, pores 0'006, bars 0'002. 



Hccbitat. — South Atlantic, Station 325, depth 2650 fathoms ; also fossil in Barbados. 



(ZOOL. CHALL. EXP. — PART XL. — 1885.) Kr 20 



