EEPORT ON THE RADIOLARIA. 173 



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

 basal breadth 0012. 



Habitat. — Indian Ocean, Madagascar, surface, Rabbe. 



8. Hexastylus pittaci, ii. sp. i 



Shell 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 0-12, pores 0-02, bars 0-002 ; length of the spines 0-06, 

 basal breadth 0-02. 



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



9. Hexastylus maximus, n. sp. 



Shell thick waUed, 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 sheU 0-.3, pores 0-01, 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. 



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

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

 pore. 



Dimensions. — Diameter of the shell 02, pores 0-012, bars 0-003 ; length of the spines 0-1, basal 

 breadth 0-025. 



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



Subgentis 2. Hexastylettus, 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). 



SheU thick waUed, 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. 



