REPORT ON THE RADIOLARIA. 85 



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3. Cromyosphcera bigemina, n. sp. 



Eadial proportion of the four spheres = 1:2:7:8. Outer cortical shell smooth, with regular 

 hexagonal pores and very thin bars ; inner cortical shell with the same number of exactly 

 corresponding, regular circular pores. Both medullary shells with regular circular pores of the 

 same breadth as the bars. (Somewhat similar to Hexacromyon elegans, PI. 24, fig. 9, also with six 

 inner radial beams, but without external radial spines.) 



Dimensions. Diameter of the four spheres (A) 0'2, (B) 017, (C) 0'05, (D) 0'025. 



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



4. Cromyosphaera cepa, n. sp. 



Eadial proportion of the four spheres = 1:2:4:5. All four shells of the same structure, thick- 

 walled, with regular circular pores, two to four times as broad as the bars ; the size of the pores 

 increases gradually from the inner to the outer shell. Surface thorny. Distance between the second 

 and third shells twice as great as that between the others. 



Dimensions. Diameter of the four spheres (A) 0125, (B) 01, (C) 0'05, (D) 0'025. 



Habitat. Fossil in Barbados. 



5. Cromyosphcera scorodonium, n. sp. 



Eadial proportion of the four spheres = 1:2:3:4. All four shells of the same structure, thin- 

 walled, with irregular roundish pores, two to four times as broad as the bars ; the size of the pores 

 increasing gradually from the inner to the outer shell. Surface smooth. Distance between each two 

 shells equal to the diameter of the innermost. 



Dimensions. Diameter of the four spheres (A) 012, (B) 0'09, (C) 0'06, (D) 0'03. 



Habitat. Central Pacific, Station 268, depth 2900 fathoms ; also fossil in Barbados. 



6. Cromyosphcera antarctica, n. sp. (PI. 30, fig. 8). 



Eadial proportion of the four spheres = 1:2:5:7. Both cortical shells with irregular polygonal 

 roundish pores ; the outermost with thinner bars and rough surface, the inner with thicker bars. 

 Both medullary shells with irregular roundish pores. 



Dimensions. Diameter of the four spheres (A) 018, (B) 012, (C) 0'05, (D) 0'025. 



Habitat. Antarctic Ocean ; in very large number, together with Rhizosphwra antarctica, in the 

 diatomaceous ooze of Station 157 (3rd. March 1874); depth 1950 fathoms. 



Subfamily CARYOSPH^RIDA, 1 Haeckel, 1881, Prodromus, pp. 449, 454. 



Definition. L iosphserida with numerous (five or more) concentric spherical 

 latticed shells', united by radial beams. 



1 Caryosphaerida = Liospheerida multiplicia = Polysphserida anacantha. 



