REPORT ON THE RADIOLARIA. 187 



25. Hexalonche heracliti, n. sp. (PI. 22, fig. 7). 



Cortical shell thick walled, covered with bunches of small spines, each bunch at the nodule point 

 between every three pores composed of four to eight conical spinules. Pores irregular roundish, 

 twice to four times as broad as the bars ; four to six on the radius. Inner shell equal to one-third of 

 the outer, connected with it by six thin radial beams, which are prolonged outside into six strong 

 triangular spines about as long as the radius. 



Dimensions. Diameter of the outer shell 0'15, pores 0'015 to 0'03, bars 0'08 ; inner shell 0'05 ; 

 length of the spines 0'06, basal breadth 0'02. 



Habitat. Indian Ocean, Madagascar, Rabbe, surface. 



26. Hexalonche xenophanis, n. sp. 



Cortical shell thin walled, covered with numerous short conical spines, four times as broad as 

 the medullary shell. Pores irregular circular, twice to eight times as broad as the bars; five to seven 

 un the radius. Six spines conical or more cylindrical, as long as the diameter of the shell or 

 longer. 



Dimensions. Diameter of the outer shell 0'16 to 0'24, pores O'Ol to 0'04, bars 0'005 ; inner shell 

 0-04 to 0-06 ; length of the spines 0'2 to 0'3, breadth 0'02. 



Habitat. Central Pacific, Stations 266 to 272, surface. 



27. Hexalonche setosa, n. sp. 



Cortical shell thin walled, covered with numerous bristle-shaped spines, half as long as the six 

 main spines. Pores irregular roundish, twice to five times as broad as the bars; ten to twelve on 

 the radius. Inner shell equal to one-fifth of the outer. Six spines conical, as long as the radius. 



Dimensions. Diameter of the outer shell - 25, pores O'OOS to 0'02, bars 0'004 ; inner shell 

 0-05 ; length of the spines 012, basal breadth 0'03. 



Habitat. South Pacific, Station 291, surface. 



28. Hexalonche hystricina, n. sp. (PI. 25, fig. 6). 



Cortical shell thick walled, covered with numerous bristle-shaped spines, half as long as the 

 six main spines. Pores irregular roundish, twice to four times as broad as the bars ; five to seven on 

 the radius. Medullary shell with very small circular pores, one-fourth of the cortical shell, con- 

 nected with it by six thin prismatic radial beams, which are prolonged outside into six strong, 

 short, three-sided pyramidal, cuspidated . spines, only half as long as the radius of the outer 

 sheU. 



Dimensions. Diameter of the outer shell 0'2, pores O015 to 0'03, bars O'OOS ; inner shell 005 ; 

 length of the spines 0'05, basal breadth 0'02. 



Habitat. Indian Ocean, Sunda Strait, surface, Rabbe. 



