REPORT ON THE RADIOLARIA. 173 



iows. Diameter of the shell 012, pores 0-012, bars 0-003 ; length of the spines 0'06 

 basal breadth 0'012. 



Habitat. Indian Ocean, Madagascar, surface, Eabbe. 



8. Hexastylus pittaci, u. sp. 



SheU thin walled, smooth. Pores regular, circular, ten to twelve times as broad as the bars ; 

 six to seven on the radius. Six spines triangular pyramidal, as long as the radius, as broad as one 

 pore. 



Dimensions. Diameter of the shell 012, pores 0-02, bars 0'002 ; length of the spines 0-06, 

 basal breadth 0'02. 



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



9. Hexastylus maximus, n. sp. 



Shell thick walled, smooth. Pores regular, circular, twice as broad as the bars ; twelve to 

 sixteen on the radius. Six spines six-sided pyramidal, half as long as the radius, three times as 

 broad as one pore. 



Dimensions. Diameter of the shell 0'3, pores O'Ol, bars 0'005 ; length of the spines 0'08, basal 

 breadth 0-03. 



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



10. Hexastylus periandri, n. sp. 



Shell thick walled, smooth. Pores regular, circular, double-edged, four times as broad as the 

 bars ; six to seven on the radius. Six spines conical, as long as the radius, twice as broad as one 

 pore. 



Dimensions. Diameter of the shell 0-2, pores 0-012, bars 0'003 ; length of the spines 01, basal 

 breadth 0'025. 



Habitat. Tropical Atlantic, Station 335, depth 1425 fathoms. 



Subgenus 2. Hexastylcttus, Haeckel. 



Definition. Pores regular or subregular, of nearly equal size and form ; surface of 

 the spherical shell spiny, covered with numerous conical or bristle-shaped radial by-spines. 



11. Hexastylus solonis, n. sp. (PI. 21, fig. 11). 



Shell thick walled, covered with numerous bristle-shaped radial spines (One-third to one-half as 

 long as the six main spines, arising from the lattice-knots). Pores regular, circular, enclosed by 

 prominent, hexagonal frames, four to six times as broad as the bars ; seven to eight on the radius. 



